Journal articles: 'CsPbBr3'

1

Dutt, V. G. Vasavi, Syed Akhil, and Nimai Mishra. "Enhancement of photoluminescence and the stability of CsPbX3 (X = Cl, Br, and I) perovskite nanocrystals with phthalimide passivation." Nanoscale 13, no. 34 (2021): 14442–49. http://dx.doi.org/10.1039/d1nr03916d.

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Zhao, Xianhao, Tianyu Tang, Quan Xie, Like Gao, Limin Lu, and Yanlin Tang. "First-principles study on the electronic and optical properties of the orthorhombic CsPbBr3 and CsPbI3 with Cmcm space group." New Journal of Chemistry 45, no. 35 (2021): 15857–62. http://dx.doi.org/10.1039/d1nj02216d.

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Chen, Lung-Chien, Ching-Ho Tien, Zong-Liang Tseng, Yu-Shen Dong, and Shengyi Yang. "Influence of All-Inorganic Halide Perovskite CsPbBr3 Quantum Dots Combined with Polymer Matrix." Materials 12, no. 6 (March 25, 2019): 985. http://dx.doi.org/10.3390/ma12060985.

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The poor stability of CsPbX3 quantum dots (QDs-CsPbX3) under wet conditions is still considered to be a key issue. In order to overcome this problem, this study presents a high molecular weight polymer matrix (polymethylmethacrylate, PMMA) incorporated into the QDs-CsPbBr3 to improve its stability and maintain its excellent optical properties. In this study, the Cs2CO3, PbO, Tetrabutylammonium Bromide (TOAB) powder, oleic acid, and toluene solvent were uniformly mixed and purified to prepare high-quality QDs powders. Then, hexane was used as a dispersing agent for the QD powder to complete the perovskite QDs-CsPbBr3 solution. Finally, a solution with different proportions of quantum dots CsPbBr3 and PMMA was prepared and discussed. In the preparation of thin films, firstly, a thin film with the structure of glass/QD-CsPbBr3/PMMA was fabricated in a glove box using a well-developed QDs-CsPbBr3 solution by changing the ratio of CsPbBr3:PMMA. The material analysis of QDs-CsPbBr3 thin films was performed with photoluminescence (PL), transmittance, absorbance, and transmission electron microscopy (TEM). The structures and morphologies were further examined to study the effect of doped PMMA on perovskite QDs-CsPbBr3.

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Xu, Jian, Hongxiang Zhang, Chunxia Wu, and Jun Dai. "Stable CsPbX3@SiO2 Perovskite Quantum Dots for White-Light Emitting Diodes." Journal of Nanoelectronics and Optoelectronics 15, no. 5 (May 1, 2020): 599–606. http://dx.doi.org/10.1166/jno.2020.2824.

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In this article, we reported the synthesis method of stable CsPbX3@SiO2 quantum dots using cesium acetate instead of cesium carbonate. The results showed that CsPbX3@SiO2 presents good crystallinity and excellent luminescence properties. The coating layer of SiO2 on the CsPbX3 quantum dots surface blocks the air and water contact and suppresses anion exchange between the quantum dots, which dramatically enhances the stability. White light-emitting diode devices are manufactured by integrating the green CsPbBr3@SiO2 quantum dots and red CsPbBr1 I2@SiO2 quantum dots on the blue GaN chips. The devices show stable white light emission with Commission Internationale de L'Eclairage color coordinates (0.3511, 0.3437), and the white light intensity keeps unchanged after continuously working for 16 hours. The results indicate that CsPbX3@SiO2 quantum dots can be an ideal down-conversion fluorescent material for white light-emitting diode devices.

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Tien, Chen, Lee, Tseng, Dong, and Lin. "High-Quality All-Inorganic Perovskite CsPbBr3 Quantum Dots Emitter Prepared by a Simple Purified Method and Applications of Light-Emitting Diodes." Energies 12, no. 18 (September 11, 2019): 3507. http://dx.doi.org/10.3390/en12183507.

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High-quality perovskite CsPbBr3 quantum dots (QDs-CsPbBr3) were prepared using the ultrasonic oscillation method, which is simple and provides variable yield according to requirements. The emission spectra over a large portion of the visible spectral region (450–650 nm) of QD-CsPbX3 (X = Cl, Br, and I) have tunable compositions that can be halide exchanged using the halide anion exchange technique and quantum size-effects. A strong peak with high intensity of (200) lattice plane of purified QDs-CsPbBr3 film is obtained, confirming the formation of an orthorhombic perovskite crystal structure of the Pnma space group. The photoluminescence of QDs-CsPbBr3 was characterized using a narrow line-width emission of 20 nm, with high quantum yields of up to 99.2%, and radioactive lifetime increasing to 26 ns. Finally, through the excellent advantages of QDs-CsPbBr3 mentioned above, purified perovskite QDs-CsPbBr3 as an active layer was utilized in perovskite quantum dot light-emitting diodes structure applications. As a result, the perovskite QDs-CsPbBr3 light-emitting diodes (LEDs) exhibits a turn-on voltage of 7 V and a maximum luminance of 5.1 cd/m2.

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Narayan, R. Lakshmi, M. V. S. Sarma, and S. V. Suryanarayana. "Ionic conductivity of CsPbCl3 and CsPbBr3." Journal of Materials Science Letters 6, no. 1 (January 1987): 93–94. http://dx.doi.org/10.1007/bf01729441.

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Zhou, Jiangcong, Yiqing Lai, Na Lin, Xiaotian Huang, Yu Chen, Yao Yao, and Bo Wang. "Incorporating CsPbBr3 Nanocrystals into Porous AlO(OH) Matrices to Improve their Stability in Backlit Displays." Nano 14, no. 12 (December 2019): 1950156. http://dx.doi.org/10.1142/s179329201950156x.

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Currently, the poor stability of inorganic perovskite CsPbX3 ([Formula: see text], Br, I) nanocrystals restricts their practical application in optoelectronic devices. Therefore, improving the stability of this material remains an urgent task for most researchers. In this study, incorporation of CsPbBr3 nanocrystals into porous AlO(OH) matrices through simple in situ synthesis was demonstrated to be an efficient approach for improving the nanocrystal stability. X-ray diffraction (XRD) revealed that the as-obtained product was composed of cubic CsPbBr3 nanocrystals and orthorhombic AlO(OH) compounds. In addition, transmission electron microscopy (TEM) revealed that the CsPbBr3 nanocrystals were successfully encapsulated by AlO(OH) matrices. The Brunauer–Emmett–Teller (BET) specific surface area was 234.96[Formula: see text]m2 g[Formula: see text] for AlO(OH) and 60.08[Formula: see text]m2 g[Formula: see text] for the CsPbBr3@AlO(OH) composites. The decrease in surface area could be attributed to the filling of the AlO(OH) pores by the CsPbBr3 nanocrystals. Further, the as-prepared composites showed red-shifted emission at 522[Formula: see text]nm and a larger full width at half-maximum (FWHM) as 26[Formula: see text]nm, compared with those of the CsPbBr3 nanocrystals with the emission at 517[Formula: see text]nm and FWHM as 17[Formula: see text]nm. More importantly, the emission intensity preserved 67% of the original value after a storage time of 120[Formula: see text]h, but bare CsPbBr3 nanocrystals rapidly degraded within only 1[Formula: see text]h in the polar ethanol solution. Finally, a light-emitting diode (LED) device was fabricated by coating the CsPbBr3@AlO(OH) composites and red commercial K2SiF6:Mn[Formula: see text] phosphors on the surface of a blue InGaN chip, covering 96% of National Television Standards Committee. The results indicate that the obtained composites could be promising luminescent materials for backlit displays.

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8

Lee, ChaeHyun, Soo Jeong Lee, YeJi Shin, Yeonsu Woo, Sung-Hwan Han, Andrés Fabián Gualdrón-Reyes, Iván Mora-Seró, and Seog Joon Yoon. "Synthetic and Post-Synthetic Strategies to Improve Photoluminescence Quantum Yields in Perovskite Quantum Dots." Catalysts 11, no. 8 (August 10, 2021): 957. http://dx.doi.org/10.3390/catal11080957.

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Making high-quality raw materials is the key to open the versatile potential of next generation materials. All-inorganic CsPbX3 (X: Cl−, Br−, and/or I−) perovskite quantum dots (PQDs) have been applied in various optoelectronic devices, such as photocatalysis, hydrogen evolution, solar cells, and light-emitting diodes, due to their outstanding photophysical properties, such as high photoluminescence quantum yield (PLQY), absorption cross-section, efficient charge separation, and so on. Specifically, for further improvement of the PLQY of the PQDs, it is essential to diminish the non-radiative charge recombination processes. In this work, we approached two ways to control the non-radiative charge recombination processes through synthetic and post-synthetic processes. Firstly, we proposed how refinement of the conventional recrystallization process for PbI2 contributes to higher PLQY of the PQDs. Secondly, after halide exchange from CsPbI3 PQDs to CsPbBr3, through an in situ spectroelectrochemical setup, we monitored the positive correlation between bromide deposition of on the surface of the perovskite and photoluminescence improvement of the CsPbBr3 perovskite film through electrodeposition. These two strategies could provide a way to enhance the photophysical properties of the perovskites for application to various perovskite-based optoelectronic devices.

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Li, Zongtao, Cunjiang Song, Longshi Rao, Hanguang Lu, Caiman Yan, Kai Cao, Xinrui Ding, Binhai Yu, and Yong Tang. "Synthesis of Highly Photoluminescent All-Inorganic CsPbX3 Nanocrystals via Interfacial Anion Exchange Reactions." Nanomaterials 9, no. 9 (September 11, 2019): 1296. http://dx.doi.org/10.3390/nano9091296.

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All-inorganic cesium lead halide perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have attracted significant attention owing to their fascinating electronic and optical properties. However, researchers still face challenges to achieve highly stable and photoluminescent CsPbX3 NCs at room temperature by the direct-synthesis method. Herein, we synthesize CsPbX3 NCs by a facile and environmentally friendly method, which uses an aqueous solution of metal halides to react with Cs4PbBr6 NCs via interfacial anion exchange reactions and without applying any pretreatment. This method produces monodisperse and air-stable CsPbX3 NCs with tunable spectra covering the entire visible range, narrow photoluminescence emission bandwidth, and high photoluminescence quantum yield (PL QY, 80%). In addition, the chemical transformation mechanism between Cs4PbBr6 NCs and CsPbX3 NCs was investigated. The Cs4PbBr6 NCs were converted to CsPbBr3 NCs first by stripping CsBr, and then, the as-prepared CsPbBr3 NCs reacted with metal halides to form CsPbX3 NCs. This work takes advantage of the chemical transformation mechanism of Cs4PbBr6 NCs and provides an efficient and environmentally friendly way to synthesize CsPbX3 NCs.

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10

Liao, Lianxing, Kunhua Quan, Xiangshi Bin, Ruosheng Zeng, and Tao Lin. "Bandgap and Carrier Dynamic Controls in CsPbBr3 Nanocrystals Encapsulated in Polydimethylsiloxane." Crystals 11, no. 9 (September 17, 2021): 1132. http://dx.doi.org/10.3390/cryst11091132.

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Bandgap tunability through ion substitution is a key feature of lead halide perovskite nanocrystals (LHP-NCs). However, the low stability and low luminescent performance of CsPbCl3 hinder their full-color applications. In this work, quantum confinement effect (QCE) was utilized to control the bandgap of CsPbBr3 NCs instead of using unstable CsPbCl3, which possess much higher emission efficiency in blue spectra region. Studies of microstructures, optical spectra and carrier dynamics revealed that tuning the reaction temperature was an effective way of controlling the NC sizes as well as QCE. Furthermore, the obtained CsPbBr3 NCs were encapsulated in a PDMS matrix while maintaining their size distribution and quantum-confined optoelectronic properties. The encapsulated samples showed long-term air and water stability. These results provide valuable guidance for both applications of LHP-NCs and principal investigation related to the carrier transition in LHP-NCs.

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11

Yun, Rui, Li Luo, Jingqi He, Jiaxi Wang, Xiaofen Li, Weiren Zhao, Zhaogang Nie, and Zhiping Lin. "Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature." Nanomaterials 9, no. 11 (October 30, 2019): 1537. http://dx.doi.org/10.3390/nano9111537.

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Cesium lead halide perovskite nanocrystals (NCs) have attracted enormous interest in light-emitting diode, photodetector and low-threshold lasing application in terms of their unique optical and electrical performance. However, little attention has been paid to other structures associated with CsPbBr3, such as CsPb2Br5. Herein, we realize a facile method to prepare dual-phase NCs with improved stability against polar solvents by replacing conventional oleylamine with cetyltrimethyl ammonium bromide (CTAB) in the reprecipitation process. The growth of NCs can be regulated with different ratios of toluene and ethanol depending on solvent polarity, which not only obtains NCs with different sizes and morphologies, but also controls phase transition between orthorhombic CsPbBr3 and tetragonal CsPb2Br5. The photoluminescence (PL) and defect density calculated exhibit considerable solvent polarity dependence, which is ascribed to solvent polarity affecting the ability of CTAB to passivate surface defects and improve stoichiometry in the system. This new synthetic method of perovskite material will be helpful for further studies in the field of lighting and detectors.

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12

Neplokh, Vladimir, Daria I. Markina, Maria Baeva, Anton M. Pavlov, Demid A. Kirilenko, Ivan S. Mukhin, Anatoly P. Pushkarev, Sergey V. Makarov, and Alexey A. Serdobintsev. "Recrystallization of CsPbBr3 Nanoparticles in Fluoropolymer Nonwoven Mats for Down- and Up-Conversion of Light." Nanomaterials 11, no. 2 (February 5, 2021): 412. http://dx.doi.org/10.3390/nano11020412.

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Inorganic halides perovskite CsPbX3 (X = Cl, Br, and I or mixed halide systems Cl/Br and Br/I) nanoparticles are efficient light-conversion objects that have attracted significant attention due to their broadband tunability over the entire visible spectral range of 410–700 nm and high quantum yield of up to 95%. Here, we demonstrate a new method of recrystallization of CsPbBr3 nanoparticles inside the electrospun fluoropolymer fibers. We have synthesized nonwoven tetrafluoroethylene mats embedding CsPbBr3 nanoparticles using inexpensive commercial precursors and syringe electrospinning equipment. The fabricated nonwoven mat samples demonstrated both down-conversion of UV light to 506 nm and up-conversion of IR femtosecond laser radiation to 513 nm green photoluminescence characterized by narrow emission line-widths of 35 nm. Nanoparticle formation inside nonwoven fibers was confirmed by TEM imaging and water stability tests controlled by fluorimetry measurements. The combination of enhanced optical properties of CsPbBr3 nanoparticles and mechanical stability and environmental robustness of highly deformable nonwoven fluoropolymer mats is appealing for flexible optoelectronic applications, while the industry-friendly fabrication method is attractive for commercial implementations.

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13

Algadi, Hassan, Chandreswar Mahata, Janghoon Woo, Minkyu Lee, Minsu Kim, and Taeyoon Lee. "Enhanced Photoresponsivity of All-Inorganic (CsPbBr3) Perovskite Nanosheets Photodetector with Carbon Nanodots (CDs)." Electronics 8, no. 6 (June 14, 2019): 678. http://dx.doi.org/10.3390/electronics8060678.

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A hybrid composite photodetector based on cesium lead bromine perovskite (CsPbBr3) nanosheets and carbon nanodots (CDs) was fabricated on a quartz substrate by a one-step method of spin-coating and hot-plate annealing. The responsivity of the CsPbBr3/CD hybrid composite photodetector was 608 mAW−1 (under a 520-nm laser diode source applied at 0.2 mWcm−2), almost three times higher than that of a CsPbBr3-based photodetector (221 mAW−1). The enhanced performance of the CsPbBr3/CD photodetector is attributable to the high band alignment of the CDs and CsPbBr3, which significantly improves the charge extraction at the CsPbBr3/CD interface. Moreover, the hybrid CsPbBr3/CD photodetector exhibited a fast response time with a rise and decay time of 1.55 and 1.77 ms, which was faster than that of a pure CsPbBr3 based photodetector, indicating that the CDs accelerate the extraction of electrons and holes trapped in the CsPbBr3 film.

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Palazon, Francisco, Sedat Dogan, Sergio Marras, Federico Locardi, Ilaria Nelli, Prachi Rastogi, Maurizio Ferretti, Mirko Prato, Roman Krahne, and Liberato Manna. "From CsPbBr3 Nano-Inks to Sintered CsPbBr3–CsPb2Br5 Films via Thermal Annealing: Implications on Optoelectronic Properties." Journal of Physical Chemistry C 121, no. 21 (May 3, 2017): 11956–61. http://dx.doi.org/10.1021/acs.jpcc.7b03389.

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Děcká, Kateřina, Adéla Suchá, Jan Král, Ivo Jakubec, Martin Nikl, Vítězslav Jarý, Vladimir Babin, Eva Mihóková, and Václav Čuba. "On the Role of Cs4PbBr6 Phase in the Luminescence Performance of Bright CsPbBr3 Nanocrystals." Nanomaterials 11, no. 8 (July 27, 2021): 1935. http://dx.doi.org/10.3390/nano11081935.

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CsPbBr3 nanocrystals have been identified as a highly promising material for various optoelectronic applications. However, they tend to coexist with Cs4PbBr6 phase when the reaction conditions are not controlled carefully. It is therefore imperative to understand how the presence of this phase affects the luminescence performance of CsPbBr3 nanocrystals. We synthesized a mixed CsPbBr3-Cs4PbBr6 sample, and compared its photo- and radioluminescence properties, including timing characteristics, to the performance of pure CsPbBr3 nanocrystals. The possibility of energy transfer between the two phases was also explored. We demonstrated that the presence of Cs4PbBr6 causes significant drop in radioluminescence intensity of CsPbBr3 nanocrystals, which can limit possible future applications of Cs4PbBr6-CsPbBr3 mixtures or composites as scintillation detectors.

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Hoffman, Jacob B., A. Lennart Schleper, and Prashant V. Kamat. "Transformation of Sintered CsPbBr3 Nanocrystals to Cubic CsPbI3 and Gradient CsPbBrxI3–x through Halide Exchange." Journal of the American Chemical Society 138, no. 27 (June 30, 2016): 8603–11. http://dx.doi.org/10.1021/jacs.6b04661.

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Rao, Longshi, Xinrui Ding, Xuewei Du, Guanwei Liang, Yong Tang, Kairui Tang, and Jin Z. Zhang. "Ultrasonication-assisted synthesis of CsPbBr3 and Cs4PbBr6 perovskite nanocrystals and their reversible transformation." Beilstein Journal of Nanotechnology 10 (March 6, 2019): 666–76. http://dx.doi.org/10.3762/bjnano.10.66.

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We demonstrate an ultrasonication-assisted synthesis without polar solvent of CsPbBr3 and Cs4PbBr6 perovskite nanocrystals (PNCs) and their reversible transformation. The as-prepared CsPbBr3 PNCs and Cs4PbBr6 PNCs exhibit different optical properties that depend on their morphology, size, and structure. The photoluminescence (PL) emission and quantum yield (QY) of the CsPbBr3 PNCs can be tuned by changing the ultrasound power, radiation time, and the height of the vibrating spear. The optimized CsPbBr3 PNCs show a good stability and high PL QY of up to 85%. In addition, the phase transformation between CsPbBr3 PNCs and Cs4PbBr6 PNCs can be obtained through varying the amount of oleylamine (OAm) and water. The mechanism of this transformation between the CsPbBr3 PNCs and Cs4PbBr6 PNCs and their morphology change are studied, involving ions equilibrium, anisotropic growth kinetics, and CsBr-stripping process.

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18

Chen, Hongyu, Yunfei Wang, Jianing Wang, and Wenyan Liu. "Thermal Stability of CsPbBr3 Perovskite Quantum Dots Assembled with SBA-15." Coatings 11, no. 8 (August 9, 2021): 953. http://dx.doi.org/10.3390/coatings11080953.

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Nowadays, the excellent performance of metal halide perovskite quantum dots (PQDs) has been demonstrated, but the stability is still a perplexing issue. In this paper, the CsPbBr3 QDs were assembled into SBA-15 for the first time. The thermal stability and photoluminescence (PL) intensity of SBA-15@CsPbBr3 QDs were improved. The PL spectra of pure CsPbBr3 QDs have red-shift (~6 nm) with the increasing temperature. However, that of SBA-15@CsPbBr3 QDs have almost no red-shift. The PL intensity of SBA-15@CsPbBr3 QDs decreased slightly after heating and cooling for several times. By comparison, the PL intensity of pure CsPbBr3 QDs decreased more significantly. The experimental results showed that SBA-15 played a significant role in improving the thermal stability of PQDs, which will have an excellent potential for the application of PQDs in the future.

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Ding, Huafeng, Yansu Shan, Jizhou Wang, Qinfeng Xu, Jing Han, Mengmeng Jiao, Kunjian Cao, et al. "Revealing photoluminescence mechanisms of single CsPbBr3/Cs4PbBr6 core/shell perovskite nanocrystals." RSC Advances 11, no. 48 (2021): 30465–71. http://dx.doi.org/10.1039/d1ra04981j.

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CsPbBr3/Cs4PbBr6 core/shell perovskite NCs were prepared with a cubic shape. The core CsPbBr3 are coated by a Cs4PbBr6 shell. The XRD, absorption spectra and PLE spectra were different from the simple mixtures of CsPbBr3 and Cs4PbBr6 in bulk.

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Yoshimura, Y., N. Tokunaga, I. Iwasaki, A. Kojima, Y. Maeda, and K. Tozaki. "Phase transitions in (CsPbCl3)1−x(CsPbBr3)xmixed crystal." Acta Crystallographica Section A Foundations of Crystallography 58, s1 (August 6, 2002): c363. http://dx.doi.org/10.1107/s010876730209949x.

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Kim, Sung Hun, Kyoung-Duck Park, and Hong Seok Lee. "Growth Kinetics and Optical Properties of CsPbBr3 Perovskite Nanocrystals." Energies 14, no. 2 (January 6, 2021): 275. http://dx.doi.org/10.3390/en14020275.

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We synthesized CsPbBr3 perovskite nanocrystals (NCs) at different reaction temperatures and tracked their growth kinetics on the basis of their optical properties and estimated size. The energies of the absorption and fluorescence (FL) peaks with increasing reaction temperature for the CsPbBr3 perovskite NCs were tuned within the regions of 2.429–2.570 eV and 2.391–2.469 eV, respectively, depending on size of the NCs (9.9–12.5 nm). The Stokes shifts of CsPbBr3 perovskite NCs with increasing NC size decreased from 101 meV to 38 meV. The full-width at half-maximum of the FL peaks for the CdSe NCs decreased from 150 meV to 90 meV because of the improved size uniformity of the CsPbBr3 perovskite NCs. The energy spacing of CsPbBr3 perovskite NCs synthesized at various reaction temperatures was calculated from Tauc plots; this information is critical for determining the bandgap energy and enables the size of the CsPbBr3 perovskite NCs to be estimated using the effective mass approximation.

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Wang, Lei, Decao Ma, Chun Guo, Xin Jiang, Mingliang Li, Tingting Xu, Jinpeng Zhu, et al. "CsPbBr3 nanocrystals prepared by high energy ball milling in one-step and structural transformation from CsPbBr3 to CsPb2Br5." Applied Surface Science 543 (March 2021): 148782. http://dx.doi.org/10.1016/j.apsusc.2020.148782.

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Cao, Yunqing, Dong Wu, Ping Zhu, Dan Shan, Xianghua Zeng, and Jun Xu. "Down-Shifting and Anti-Reflection Effect of CsPbBr3 Quantum Dots/Multicrystalline Silicon Hybrid Structures for Enhanced Photovoltaic Properties." Nanomaterials 10, no. 4 (April 17, 2020): 775. http://dx.doi.org/10.3390/nano10040775.

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Over the past couple of decades, extensive research has been conducted on silicon (Si) based solar cells, whose power conversion efficiency (PCE) still has limitations because of a mismatched solar spectrum. Recently, a down-shifting effect has provided a new way to improve cell performances by converting ultraviolet (UV) photons to visible light. In this work, caesium lead bromide perovskite quantum dots (CsPbBr3 QDs) are synthesized with a uniform size of 10 nm. Exhibiting strong absorption of near UV light and intense photoluminescence (PL) peak at 515 nm, CsPbBr3 QDs show a potential application of the down-shifting effect. CsPbBr3 QDs/multicrystalline silicon (mc-Si) hybrid structured solar cells are fabricated and systematically studied. Compared with mc-Si solar cells, CsPbBr3 QDs/mc-Si solar cells have obvious improvement in external quantum efficiency (EQE) within the wavelength ranges of both 300 to 500 nm and 700 to 1100 nm, which can be attributed to the down-shifting effect and the anti-reflection property of CsPbBr3 QDs through the formation of CsPbBr3 QDs/mc-Si structures. Furthermore, a detailed discussion of contact resistance and interface defects is provided. As a result, the coated CsPbBr3 QDs are optimized to be two layers and the solar cell exhibits a highest PCE of 14.52%.

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He, Haiyang, Shiliang Mei, Zhihao Chen, Siyu Liu, Zhuoqi Wen, Zhongjie Cui, Dan Yang, et al. "Thioacetamide-ligand-mediated synthesis of CsPbBr3–CsPbBr3 homostructured nanocrystals with enhanced stability." Journal of Materials Chemistry C 9, no. 34 (2021): 11349–57. http://dx.doi.org/10.1039/d1tc02118d.

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Qin, Chaochao, Zhinan Jiang, Zhongpo Zhou, Yufang Liu, and Yuhai Jiang. "Excitation Wavelength and Intensity-Dependent Multiexciton Dynamics in CsPbBr3 Nanocrystals." Nanomaterials 11, no. 2 (February 11, 2021): 463. http://dx.doi.org/10.3390/nano11020463.

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CsPbBr3 has attracted great attention due to unique optical properties. The understanding of the multiexciton process is crucial for improving the performance of the photoelectric devices based on CsPbBr3 nanocrystals. In this paper, the ultrafast dynamics of CsPbBr3 nanocrystals is investigated by using femtosecond transient absorption spectroscopy. It is found that Auger recombination lifetime increases with the decrease of the excitation intensity, while the trend is opposite for the hot-exciton cooling time. The time of the hot-carriers cooling to the band edge is increased when the excitation energy is increased from 2.82 eV (440 nm) to 3.82 eV (325 nm). The lifetime of the Auger recombination reaches the value of 126 ps with the excitation wavelength of 440 nm. The recombination lifetime of the single exciton is about 7 ns in CsPbBr3 nanocrystals determined by nanosecond time-resolved photoluminescence spectroscopy. The exciton binding energy is 44 meV for CsPbBr3 nanocrystals measured by the temperature-dependent steady-state photoluminescence spectroscopy. These findings provide a favorable insight into applications such as solar cells and light-emitting devices based on CsPbBr3 nanocrystals.

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Falsini, Naomi, Nicola Calisi, Giammarco Roini, Andrea Ristori, Francesco Biccari, Paolo Scardi, Chiara Barri, Monica Bollani, Stefano Caporali, and Anna Vinattieri. "Large-Area Nanocrystalline Caesium Lead Chloride Thin Films: A Focus on the Exciton Recombination Dynamics." Nanomaterials 11, no. 2 (February 9, 2021): 434. http://dx.doi.org/10.3390/nano11020434.

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Caesium lead halide perovskites were recently demonstrated to be a relevant class of semiconductors for photonics and optoelectronics. Unlike CsPbBr3 and CsPbI3, the realization of high-quality thin films of CsPbCl3, particularly interesting for highly efficient white LEDs when coupled to converting phosphors, is still a very demanding task. In this work we report the first successful deposition of nanocrystalline CsPbCl3 thin films (70–150 nm) by radio frequency magnetron sputtering on large-area substrates. We present a detailed investigation of the optical properties by high resolution photoluminescence (PL) spectroscopy, resolved in time and space in the range 10–300 K, providing quantitative information concerning carriers and excitons recombination dynamics. The PL is characterized by a limited inhomogeneous broadening (~15 meV at 10 K) and its origin is discussed from detailed analysis with investigations at the micro-scale. The samples, obtained without any post-growth treatment, show a homogeneous PL emission in spectrum and intensity on large sample areas (several cm2). Temperature dependent and time-resolved PL spectra elucidate the role of carrier trapping in determining the PL quenching up to room temperature. Our results open the route for the realization of large-area inorganic halide perovskite films for photonic and optoelectronic devices.

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Chen, Lung-Chien, Ching-Ho Tien, Sin-Liang Ou, Kun-Yi Lee, Jianjun Tian, Zong-Liang Tseng, Hao-Tian Chen, Hao-Chung Kuo, and An-Cheng Sun. "Perovskite CsPbBr3 Quantum Dots Prepared Using Discarded Lead–Acid Battery Recycled Waste." Energies 12, no. 6 (March 22, 2019): 1117. http://dx.doi.org/10.3390/en12061117.

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Perovskite CsPbBr3 quantum dot (CsPbBr3-QD) recovery was performed using lead scrap from lead storage batteries. The perovskite CsPbBr3-QD characteristics were analyzed using different PbO/recycled PbO2 ratios. Scanning electron microscopy (SEM) was used to observe the film surface morphology and cross-section. High-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) were used to observe the perovskite CsPbBr3-QDs’ structural characteristics. A photoluminescence (PL) measurement system was used to analyze the optical properties. The results show that lead scrap from lead–acid batteries as a material for perovskite CsPbBr3-QD production can be successfully synthesized. This saves material and also proves that recycling is valuable. The proposed approach is helpful for future material shortages and materials not easily accessible. Although the efficiency is not very high, this process will be purified using recycled lead in the future to achieve higher quantum yield.

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Chi, Kailin, Hansi Xu, Bingtao Feng, Xianwei Meng, Daoyu Yu, and Qian Li. "Controlled Growth of Porous InBr3: PbBr2 Film for Preparation of CsPbBr3 in Carbon-Based Planar Perovskite Solar Cells." Nanomaterials 11, no. 9 (September 16, 2021): 2408. http://dx.doi.org/10.3390/nano11092408.

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Due to the low solubility of CsBr in organic solvents, the CsPbBr3 film prepared by the multi-step method has holes and insufficient thickness, and the light absorption capacity and current density of the perovskite film hinder the further improvement in the power conversion efficiency (PCE) of CsPbBr3 solar cells. In this study, we introduced InBr3 into the PbBr2 precursor solution and adjusted the concentration of PbBr2, successfully prepared PbBr2 with a porous structure on the compact TiO2 (c-TiO2) substrate to ensure that it fully reacted with CsBr, and obtained the planar carbon-based CsPbBr3 solar cells with high-quality perovskite film. The results reveal that the porous PbBr2 structure and the increasing PbBr2 concentration are beneficial to increase the thickness of the CsPbBr3 films, optimize the surface morphology, and significantly enhance the light absorption capacity. Finally, the PCE of the CsPbBr3 solar cells obtained after conditions optimization was 5.76%.

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Meng, Xianwei, Kailin Chi, Qian Li, Bingtao Feng, Haodi Wang, Tianjiao Gao, Pengyu Zhou, Haibin Yang, and Wuyou Fu. "Fabrication of Porous Lead Bromide Films by Introducing Indium Tribromide for Efficient Inorganic CsPbBr3 Perovskite Solar Cells." Nanomaterials 11, no. 5 (May 11, 2021): 1253. http://dx.doi.org/10.3390/nano11051253.

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In the process of preparing CsPbBr3 films by two-step or multi-step methods, due to the low solubility of CsBr in organic solvents, the prepared perovskite films often have a large number of holes, which is definitely not conducive to the performance of CsPbBr3 perovskite solar cells (PSCs). In response to this problem, this article proposed a method of introducing InBr3 into the PbBr2 precursor to prepare a porous PbBr2 film to increase the reaction efficiency between CsBr and PbBr2 and achieve the purpose of In (Ⅲ) incorporation, which not only optimized the morphology of the produced CsPbBr3 film but also enhanced the charge extraction and transport capabilities, which was ascribed to the reduction of the trap state density and impurity phases in the perovskite films, improving the performance of CsPbBr3 PSCs. At the optimal InBr3 concentration of 0.21 M, the InBr3:CsPbBr3 perovskite solar cell exhibited a power conversion efficiency of 6.48%, which was significantly higher than that of the pristine device.

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Huang, Runda, Menglong Zhang, Zhaoqiang Zheng, Kunqiang Wang, Xiao Liu, Qizan Chen, and Dongxiang Luo. "Photocatalytic Degradation of Tobacco Tar Using CsPbBr3 Quantum Dots Modified Bi2WO6 Composite Photocatalyst." Nanomaterials 11, no. 9 (September 17, 2021): 2422. http://dx.doi.org/10.3390/nano11092422.

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Polycyclic aromatic hydrocarbons (PAHs) in tobacco tar are regarded as a significant threat to human health. PAHs are formed due to the incomplete combustion of organics in tobacco and cigarette paper. Herein, for the first time, we extended the application of CsPbBr3 quantum dots (CsPbBr3) to the photocatalytic degradation of tobacco tar, which was collected from used cigarette filters. To optimize the photoactivity, CsPbBr3 was coupled with Bi2WO6 for the construction of a type-II photocatalyst. The photocatalytic performance of the CsPbBr3/Bi2WO6 composite was evaluated by the degradation rate of PAHs from tobacco tar under simulated solar irradiation. The results revealed that CsPbBr3/Bi2WO6 possesses a large specific surface area, outstanding absorption ability, good light absorption and rapid charge separation. As a result, in addition to good stability, the composite photocatalyst performed remarkably well in degrading PAHs (over 96% were removed in 50 mins of irradiation by AM 1.5 G). This study sheds light on promising novel applications of halide perovskite.

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Zhang, Jing, Li Wang, Wenwen Liu, Mengsha Cao, Jing Zhang, Ningyi Yuan, Shuai Zhang, and Zhongze Gu. "Synthesis of Au or Pt@Perovskite Nanocrystals via Interfacial Photoreduction." Catalysts 11, no. 2 (January 27, 2021): 174. http://dx.doi.org/10.3390/catal11020174.

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The surface modification of perovskite nanocrystals (NCs) (i.e., their decoration with noble metals) holds great promise with respect to the tailoring of their properties but has remained a challenge because perovskite NCs are extremely sensitive to water and alcohols. In this study, Au or Pt@CsPbBr3 NCs were successfully synthesized by photoreduction at the water/hexane interface. First, Cs4PbBr6 NCs were synthesized through the hot-injection method. Then, Cs4PbBr6 was transformed into CsPbBr3 and subjected to noble metal modification, both at the interface. The synthesized CsPbBr3 NCs exhibited a cubic perovskite phase and had an average size of approximately 13.5 nm. The deposited Au and Pt nanoparticles were crystalline, with a face-centered cubic lattice and average diameters of approximately 3.9 and 4.4 nm, respectively. The noble metal modification process had almost no effect on the steady-state photoluminescence (PL) emission wavelength but affected the charge-recombination kinetics of the CsPbBr3 NCs. Time-resolved PL decay spectral analysis indicated that the fluorescence lifetimes of the Au and Pt@CsPbBr3 NCs were shorter than those of the pure CsPbBr3 NCs, probably owing to the quenching of the free charges because of electron transfer from the perovskite to the noble metal nanoparticles.

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32

Sun, Changjiu, Junli Wei, Jian Zhao, Yuanzhi Jiang, Yilong Wang, Haiqing Hu, Xin Wang, Yongqin Zhang, and Mingjian Yuan. "Hard and soft Lewis-base behavior for efficient and stable CsPbBr3 perovskite light-emitting diodes." Nanophotonics 10, no. 8 (June 1, 2020): 2157–66. http://dx.doi.org/10.1515/nanoph-2021-0003.

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Abstract All-inorganic CsPbBr3 perovskite is an attractive emission material for high-stability perovskite light-emitting diodes (PeLEDs), due to the high thermal and chemical stability. However, the external quantum efficiencies (EQEs) of CsPbBr3 based PeLEDs are still far behind their organic–inorganic congeners. Massive defect states on the surface of CsPbBr3 perovskite grains should be the main reason. Lewis base additives have been widely used to passivate surface defects. However, systematic investigations which relate to improving the passivation effect via rational molecule design are still lacking. Here, we demonstrate that the CsPbBr3 film’s optical and electrical properties can be significantly boosted by tailoring the hardness–softness of the Lewis base additives. Three carboxylate Lewis bases with different tail groups are selected to in-situ passivate CsPbBr3 perovskite films. Our research indicates that 4-(trifluoromethyl) benzoate acid anion (TBA−) with the powerful electron-withdrawing group trifluoromethyl and benzene ring possesses the softest COO− bonding head. TBA− thus acts as a soft Lewis base and possesses a robust combination with unsaturated lead atoms caused by halogen vacancies. Based on this, the all-inorganic CsPbBr3 PeLEDs with a maximum EQE up to 16.75% and a half-lifetime over 129 h at an initial brightness of 100 cd m−2 is thus delivered.

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Chen, Lung-Chien, Ching-Ho Tien, Kuan-Lin Lee, and Yu-Ting Kao. "Efficiency Improvement of MAPbI3 Perovskite Solar Cells Based on a CsPbBr3 Quantum Dot/Au Nanoparticle Composite Plasmonic Light-Harvesting Layer." Energies 13, no. 6 (March 20, 2020): 1471. http://dx.doi.org/10.3390/en13061471.

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We demonstrate a method to enhance the power conversion efficiency (PCE) of MAPbI3 perovskite solar cells through localized surface plasmon (LSP) coupling with gold nanoparticles:CsPbBr3 hybrid perovskite quantum dots (AuNPs:QD-CsPbBr3). The plasmonic AuNPs:QD-CsPbBr3 possess the features of high light-harvesting capacity and fast charge transfer through the LSP resonance effect, thus improving the short-circuit current density and the fill factor. Compared to the original device without Au NPs, a 27.8% enhancement in PCE of plasmonic AuNPs:QD-CsPbBr3/MAPbI3 perovskite solar cells was achieved upon 120 μL Au NP solution doping. This improvement can be attributed to the formation of surface plasmon resonance and light scattering effects in Au NPs embedded in QD-CsPbBr3, resulting in improved light absorption due to plasmonic nanoparticles.

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Cheng, Ruolin, Elke Debroye, Johan Hofkens, and Maarten B. J. Roeffaers. "Efficient Photocatalytic CO2 Reduction with MIL-100(Fe)-CsPbBr3 Composites." Catalysts 10, no. 11 (November 20, 2020): 1352. http://dx.doi.org/10.3390/catal10111352.

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Bromide-based metal halide perovskites (MHPs) are promising photocatalysts with strong blue-green light absorption. Composite photocatalysts of MHPs with MIL-100(Fe), as a powerful photocatalyst itself, have been investigated to extend the responsiveness towards red light. The composites, with a high specific surface area, display an enhanced solar light response, and the improved charge carrier separation in the heterojunctions is employed to maximize the photocatalytic performance. Optimization of the relative composition, with the formation of a dual-phase CsPbBr3 to CsPb2Br5 perovskite composite, shows an excellent photocatalytic performance with 20.4 μmol CO produced per gram of photocatalyst during one hour of visible light irradiation.

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35

Li, Meng, Xiao Zhang, Peng Wang, and Ping Yang. "Metastable γ-CsPbI3 Perovskite Nanocrystals Created Using Aged Orthorhombic CsPbBr3." Journal of Physical Chemistry C 125, no. 13 (March 26, 2021): 7109–18. http://dx.doi.org/10.1021/acs.jpcc.0c09672.

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36

Cao, Qinxuan, Asif Ilyas, Shuai Zhang, Zhijie Ju, Fangling Sun, Tianyu Liu, Yang(Michael) Yang, Yunhao Lu, Xinfeng Liu, and Renren Deng. "Lanthanide-doping enables kinetically controlled growth of deep-blue two-monolayer halide perovskite nanoplatelets." Nanoscale 13, no. 26 (2021): 11552–60. http://dx.doi.org/10.1039/d1nr02508b.

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The doping of lanthanides enables the preparation of high-quality deep-blue emitting 2-monolayer CsPbBr3 nanoplatelets by enhancing the energy barrier for intermediates in the transformation of 2-monolayer to 3-monolayer CsPbBr3 nanoplatelets.

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37

Jung, Sujeong, Jae Ho Kim, Jin Woo Choi, Jae-Wook Kang, Sung-Ho Jin, Youngho Kang, and Myungkwan Song. "Enhancement of Photoluminescence Quantum Yield and Stability in CsPbBr3 Perovskite Quantum Dots by Trivalent Doping." Nanomaterials 10, no. 4 (April 9, 2020): 710. http://dx.doi.org/10.3390/nano10040710.

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We determine the influence of substitutional defects on perovskite quantum dots through experimental and theoretical investigations. Substitutional defects were introduced by trivalent dopants (In, Sb, and Bi) in CsPbBr3 by ligand-assisted reprecipitation. We show that the photoluminescence (PL) emission peak shifts toward shorter wavelengths when doping concentrations are increased. Trivalent metal-doped CsPbBr3 enhanced the PL quantum yield (~10%) and air stability (over 10 days). Our findings provide new insights into the influence of substitutional defects on substituted CsPbBr3 that underpin their physical properties.

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38

Qaid, Saif M. H., Hamid M. Ghaithan, Bandar Ali Al-Asbahi, and Abdullah S. Aldwayyan. "Ultra-Stable Polycrystalline CsPbBr3 Perovskite–Polymer Composite Thin Disk for Light-Emitting Applications." Nanomaterials 10, no. 12 (November 29, 2020): 2382. http://dx.doi.org/10.3390/nano10122382.

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Organic–inorganic halide organometal perovskites have demonstrated very promising performance in optoelectronic applications, but their relatively poor chemical and colloidal stability hampers the further improvement of devices based on these materials. Perovskite material engineering is crucial for achieving high photoluminescence quantum yields (PLQYs) and long stability. Herein, these goals are attained by incorporating bulk-structure CsPbBr3, which prevents colloidal degradation, into polymethyl methacrylate (PMMA) polymer in thin-disk form. This technology can potentially realize future disk lasers with no optical and structural contributions from the polymer. The polycrystalline CsPbBr3 perovskite particles were simply obtained by using a mechanical processing technique. The CsPbBr3 was then incorporated into the PMMA polymer using a solution blending method. The polymer enhanced the PLQYs by removing the surface trap states and increasing the water resistance and stability under ambient conditions. In our experimental investigation, the CsPbBr3/PMMA composites were extraordinarily stable and remained strongly luminescent after water immersion for three months and air exposure for over one year, maintaining 80% of their initial photoluminescence intensity. The CsPbBr3/PMMA thin disk produced amplified spontaneous emission for a long time in air and for more than two weeks in water.

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39

Zhang, Xu, Qing Li, Shikai Yan, Wei Lei, Jing Chen, and Khan Qasim. "A Novel Phototransistor Device with Dual Active Layers Composited of CsPbBr3 and ZnO Quantum Dots." Materials 12, no. 8 (April 13, 2019): 1215. http://dx.doi.org/10.3390/ma12081215.

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Taking advantage of a large light absorption coefficient, long charge carrier diffusion length and low-cost solution processing, all-inorganic halides perovskite CsPbBr3 quantum dots (QDs) are combined with a ZnO QD film to construct a high-performance photodetector. In this work, a novel photodetector device based on transistor structure with dual active layers composed of CsPbBr3 and ZnO film is proposed. In this structure, CsPbBr3 film functions as the light-absorbing layer and ZnO film acts as the conducting layer. Owing to the high electron mobility and hole-blocking nature of the ZnO QDs film, the photo-induced electron-hole pairs can be separated efficiently. As a result, the device exhibits high performance with response of 43.5 A/W, high detection up to 5.02 × 1011 Jones and on/off ratio of 5.6 × 104 under 365 nm light illumination. Compared with the ZnO-only phototransistor (the photodetector with the structure of transistor) the performance of the CsPbBr3 phototransistor showed significant improvement, which is superior to the majority of photodetectors prepared by perovskite. This work demonstrates that the ZnO QDs film can be applied in the photodetector device as a functional conducting layer, and we believe that the hybrid CsPbBr3/ZnO phototransistor would promote the development of low-cost and high-performance photodetectors.

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40

Zhou, Yufeng, Yanxia Yu, Yaqian Zhang, Xiaodong Liu, Haisheng Yang, Xiaojuan Liang, Wei Xia, and Weidong Xiang. "Highly Photoluminescent CsPbBr3/CsPb2Br5 NCs@TEOS Nanocomposite in Light-Emitting Diodes." Inorganic Chemistry 60, no. 6 (February 11, 2021): 3814–22. http://dx.doi.org/10.1021/acs.inorgchem.0c03573.

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41

Zaitseva, I. Ya, I. S. Kovaleva, and V. A. Fedorov. "Glass formation along the CsHgBr3-CsPbBr3, Cs2HgBr4-CsPbBr3, and CsHg2Br5-CsPbBr3 sections of the HgBr2-PbBr2-CsBr ternary system." Russian Journal of Inorganic Chemistry 53, no. 8 (August 2008): 1300–1302. http://dx.doi.org/10.1134/s0036023608080251.

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42

Worku, Michael, Yu Tian, Chenkun Zhou, Haoran Lin, Maya Chaaban, Liang-jin Xu, Qingquan He, et al. "Hollow metal halide perovskite nanocrystals with efficient blue emissions." Science Advances 6, no. 17 (April 2020): eaaz5961. http://dx.doi.org/10.1126/sciadv.aaz5961.

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Metal halide perovskite nanocrystals (NCs) have emerged as new-generation light-emitting materials with narrow emissions and high photoluminescence quantum efficiencies (PLQEs). Various types of perovskite NCs, e.g., platelets, wires, and cubes, have been discovered to exhibit tunable emissions across the whole visible spectrum. Despite remarkable advances in the field of perovskite NCs, many nanostructures in inorganic NCs have not yet been realized in metal halide perovskites, and producing highly efficient blue-emitting perovskite NCs remains challenging and of great interest. Here, we report the discovery of highly efficient blue-emitting cesium lead bromide (CsPbBr3) perovskite hollow NCs. By facile solution processing of CsPbBr3 precursor solution containing ethylenediammonium bromide and sodium bromide, in situ formation of hollow CsPbBr3 NCs with controlled particle and pore sizes is realized. Synthetic control of hollow nanostructures with quantum confinement effect results in color tuning of CsPbBr3 NCs from green to blue, with high PLQEs of up to 81%.

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43

Sanders, S., G. Simkus, J. Riedel, A. Ost, A. Schmitz, F. Muckel, G. Bacher, M. Heuken, A. Vescan, and H. Kalisch. "Showerhead-assisted chemical vapor deposition of CsPbBr3 films for LED applications." Journal of Materials Research 36, no. 9 (May 14, 2021): 1813–23. http://dx.doi.org/10.1557/s43578-021-00239-w.

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AbstractCsPbBr3 represents a highly attractive material for perovskite light-emitting diodes (PeLEDs) in the green spectral range. However, the lack of deposition tools for reproducible and scalable growth of perovskite films is one of the major obstacles hindering PeLED commercialization. Here, we employ the highly scalable showerhead-assisted chemical vapor deposition (CVD) method to produce uniform pinhole-free CsPbBr3 films for PeLED application. The precursors CsBr and PbBr2 are evaporated under low vacuum in N2 carrier gas. By adjusting the PbBr2 sublimation temperature, process conditions for CsBr-rich, stoichiometric, and PbBr2-rich CsPbBr3 layer growth have been developed. A substrate temperature of 160 °C enables direct growth of these CsPbBr3 films on a polymeric hole transport layer (HTL), finally yielding PeLEDs with a maximum luminance of 125 cd/m2. Although the device efficiency still lags behind solution-processed counterparts, our approach presents the first demonstration of PeLEDs containing CsPbBr3 films processed in a perovskite showerhead-assisted CVD reactor. Graphic abstract

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44

Simkus, Gintautas, Simon Sanders, Dominik Stümmler, Andrei Vescan, Holger Kalisch, and Michael Heuken. "High-Intensity CsPbBr3 Perovskite LED using Poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine) as Hole Transport and Electron-Blocking Layer." MRS Advances 5, no. 8-9 (2020): 411–19. http://dx.doi.org/10.1557/adv.2020.23.

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AbstractThe majority of highly efficient perovskite light-emitting diodes (PeLED) contain PEDOT:PSS (poly(3,4-ethylenedioxythiophene):polystyrenesulfonate) as hole transport layer (HTL). However, the hygroscopic and acidic nature of PEDOT:PSS may lead to deterioration of PeLED performance. Moreover, due to its inferior electron-blocking properties, an additional electron-blocking layer (EBL) is required to establish charge balance and consequently obtain superior emission characteristics in typically electron-rich PeLED structures. In this work, PTAA (poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine)) serving both as HTL and EBL is employed to substitute PEDOT:PSS in PeLED. The perovskite CsPbBr3 is chosen as emissive layer (EML) material due to its high color purity and photoluminescence (PL) quantum yield. Dense CsPbBr3 films are fabricated on PTAA-coated ITO substrates by employing a one-step spin-coating approach based on nonstoichiometric perovskite precursor solutions. To suppress non-radiative recombination, a small amount of methylammonium bromide (MABr) is incorporated in the CsPbBr3 lattice. The resulting films exhibit excellent coverage and PL intensity. PeLED containing pure CsPbBr3 films as EML show a green emission with a peak at 520 nm, maximum luminance of 11,000 cd/m2, an external quantum efficiency (EQE) of 3.3 % and a current efficiency (CE) of 10.3 cd/A. Further enhancement to 21,000 cd/m2, 7.5 % and 27.0 cd/A is demonstrated by PeLED with MABr-doped CsPbBr3 layers.

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Liu, Zhuang, Jianlin Chen, Caiyou Huang, Too Gideon Kiprono, Wusong Zhao, Wei Qiu, Zhuoyin Peng, and Jian Chen. "Dependence of Precursors on Solution-Processed SnO2 as Electron Transport Layers for CsPbBr3 Perovskite Solar Cells." Nano 15, no. 12 (November 25, 2020): 2050161. http://dx.doi.org/10.1142/s1793292020501611.

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In this paper, three kinds of SnO2 precursors were comparatively investigated for low temperature solution-processed SnO2 films as electron transport layers (ETL) of CsPbBr3 perovskite solar cells (PSCs). It was found that the precursor state and solvent type played an important role on the crystallinity and film-forming performance of SnO2. All-inorganic hole-transport-layer-free planar CsPbBr3 PSCs with an architecture of FTO/SnO2/CsPbBr3/carbon were fabricated. The best-performing device with SnO2 as ETL by reflux condensation sol spin-coating technique delivered a champion power conversion efficiency (PCE) as high as 6.27%, with a short-circuit current density of 7.36[Formula: see text]mA[Formula: see text]cm[Formula: see text], an open-circuit voltage of 1.29[Formula: see text]V, and a fill factor of 65.9%. It was comparable to the highest PCE record 6.7% of the device with the same structure based on TiO2-ETL so far. Moreover, the CsPbBr3 devices without encapsulation exhibited good stability after being stored under ambient conditions with a relative humidity of [Formula: see text]% at room temperature over 1000[Formula: see text]h and 60[Formula: see text]C for 720[Formula: see text]h, respectively. The results promise the commercial potential of CsPbBr3 PSCs using reflux condensation low-temperature solution-processed SnO2 as ETLs for flexible polymer photovoltaic applications.

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46

Bergamini, Linda, Nicola Sangiorgi, Angela Gondolini, and Alessandra Sanson. "CsPbBr3 for photoelectrochemical cells." Solar Energy 212 (December 2020): 62–72. http://dx.doi.org/10.1016/j.solener.2020.10.047.

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47

Yang, Feng, Cong Wang, Yuhao Pan, Xieyu Zhou, Xianghua Kong, and Wei Ji. "Surface stabilized cubic phase of CsPbI3 and CsPbBr3 at room temperature." Chinese Physics B 28, no. 5 (May 2019): 056402. http://dx.doi.org/10.1088/1674-1056/28/5/056402.

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48

De Matteis, Fabio, Francesco Vitale, Simone Privitera, Erica Ciotta, Roberto Pizzoferrato, Amanda Generosi, Barbara Paci, et al. "Optical Characterization of Cesium Lead Bromide Perovskites." Crystals 9, no. 6 (May 28, 2019): 280. http://dx.doi.org/10.3390/cryst9060280.

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CsPbBr3 and Cs4PbBr6 perovskite powders have been synthesized through a relatively simple low-temperature and low-cost method. Nanocrystalline films have also been deposited from solutions with four different molar compositions of binary salt precursors. Optical absorption, emission and excitation spectra have been performed in the UV-visible spectral range while X-ray diffraction (XRD) has been recorded to characterize the nanocrystal morphology for the different molar compositions. A preferential orientation of crystallites along the (024) crystalline plane has been observed as a function of the different deposition conditions in films growth. All the crystals show an absorption edge around 530 nm; Tauc plots of the absorption returned bandgaps ranging from 2.29 to 2.35 eV characteristic of CsPbBr3 phase. We attribute the UV absorption band peaked at 324 nm to the fundamental band-to-band transition for Cs4PbBr6. It was observed that the samples with the most ordered Cs4PbBr6 crystals exhibited the most intense emission of light, with a bright green emission at 520 nm, which are however due to the luminescence of the inclusion of CsPbBr3 nanoclusters into the Cs4PbBr6. The latter shows instead an intense UV emission. Differently, the pure CsPbBr3 powder did not show any intense fluorescent emission. The excitation spectra of the green fluorescent emission in all samples closely resemble the CsPbBr3 absorption with the peculiar dip around 324 nm as expected from density of state calculations reported in the literature.

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Чикалова-Лузина, О. П., В. М. Вяткин, И. П. Щербаков, and А. Н. Алешин. "Механизм электролюминесценции в светоизлучающих полевых транзисторах на основе пленок нанокристаллов перовскита в матрице полупроводникового полимера." Физика твердого тела 62, no. 8 (2020): 1333. http://dx.doi.org/10.21883/ftt.2020.08.49623.073.

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The mechanisms of radiative recombination and electroluminescence (EL) in structures based on CsPbBr3 perovskite nanocrystal (NC) films in the matrix of semiconductor polymer MEH-PPV are considered. It has been shown that two mechanisms determine the EL intensity in light emitting field effect transistors (LE-FETs) with active layers based on MEH-PPV: CsPbBr3 (NC) films: recombination of charged carriers injected into the polymer matrix and recombination at the polymer / NC perovskite interface. The results of theoretical and experimental studies have shown that the superlinear dependence of the EL intensity on the level of electrical excitation in LE-FETs based on MEH-PPV: CsPbBr3 (NC) is due to the mechanism of electron tunneling through the potential barrier at the electrode.

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Seth, Sudipta, Navendu Mondal, Satyajit Patra, and Anunay Samanta. "Fluorescence Blinking and Photoactivation of All-Inorganic Perovskite Nanocrystals CsPbBr3 and CsPbBr2I." Journal of Physical Chemistry Letters 7, no. 2 (January 6, 2016): 266–71. http://dx.doi.org/10.1021/acs.jpclett.5b02639.

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Journal articles on the topic 'CsPbBr3'

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