Artykuły w czasopismach: „CuInS2 QD”

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Gagandeep, Mukhtiyar Singh, Ramesh Kumar, Vinamrita Singh i Sunita Srivastava. "Theoretical study of highly efficient CH₃NH₃SnI₃ based perovskite solar cell with CuInS₂ quantum dot". Semiconductor Science and Technology 37, nr 2 (24.12.2021): 025010. http://dx.doi.org/10.1088/1361-6641/ac4325.

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Abstract Simulation studies have been carried out for the n–i–p perovskite solar cell (PSC) structure i.e. ITO/SnO2/CH3NH3PbI3/CuInS2/Au. We have considered this cell as our primary structure and is simulated using solar cell capacitance simulator-1D software. Here, the CuInS2 quantum dot (CIS QD) acts as an inorganic hole transporting layer. Further, the use of the CIS QD in PSCs has been explored by simulating 20 different cell structures. These PSCs are based on recently used absorber layers, i.e. MASnI3, FAPbI3, and (FAPbI3)0.97 (MAPbBr1.5Cl1.5)0.03, and electron transporting layers, i.e. SnO2, TiO2, ZnO, C60, and IGZO. The performance of all structures has been optimized by varying the thickness of the absorber layers and electron transporting layers. The cell structure, ITO/SnO2/CH3NH3SnI3/CuInS2/Au, has been found to exhibit the highest power conversion efficiency of 21.79% as compared to other cells. Investigations have also been carried out to analyze the effect of defect density in the absorber layer and the interface of the cell structure. In addition, the cell performance has been ascertained by examining the impact of operating temperature, metal contact work function and that of resistance in series as well as in parallel. The simulation results of our primary cell structure are found to be in good agreement with the recent experimental study.

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Kim, Namhun, Wonkyung Na, Wenping Yin, Hoseok Jin, Tae Kyu Ahn, Sung Min Cho i Heeyeop Chae. "CuInS2/ZnS quantum dot-embedded polymer nanofibers for color conversion films". Journal of Materials Chemistry C 4, nr 13 (2016): 2457–62. http://dx.doi.org/10.1039/c5tc03967c.

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Guguła, Krzysztof, i Michael Bredol. "Transparent CuInS2 PMMA Nanocomposites Luminescent in the Visible and NIR Region". Zeitschrift für Naturforschung B 69, nr 2 (1.02.2014): 217–23. http://dx.doi.org/10.5560/znb.2014-3264.

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Nanocomposites combining functional nanoparticles and transparent polymers allow for stabilization of filler properties over long periods of time while retaining transparency of the polymer matrix. Here we employ CuInS2/ZnS quantum dots (QDs), ternary visible- and NIR-emitting semiconductors as wavelength-tunable luminescent fillers. Luminescence in the near infrared (NIR) is of particular interest in medicine which allows deep penetration into human tissue enabling in vivo diagnostics and treatment, while visible emitters may serve as color converters in displays or lighting. To stabilize the optical properties of QDs and prevent agglomeration, polymethyl metacrylate (PMMA) was chosen as a matrix. These novel polymer nanocomposites (PNCs) show good optical properties and stability under ambient conditions, and can be easily deposited over large areas. High-quality QDs and hydrophobic functionalization with long-chain hydrocarbons are a prerequisite for embedding into a PMMA matrix. Transparent PNC films without visible scattering losses were obtained for 1 wt-% QD loading with respect to the polymer. Partial transparency is retained up to 10 wt-% QD loading and vanishes rapidly at higher loading. Luminescence properties increase up to 5 wt-% and then decrease rapidly due to QD agglomeration and reabsorption between adjacent particles. Potential applications include converter materials for medical applications, laser layers, displays and white LEDs.

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Wepfer, Svenja, Julia Frohleiks, A.-Ra Hong, Ho Seong Jang, Gerd Bacher i Ekaterina Nannen. "Solution-Processed CuInS2-Based White QD-LEDs with Mixed Active Layer Architecture". ACS Applied Materials & Interfaces 9, nr 12 (16.03.2017): 11224–30. http://dx.doi.org/10.1021/acsami.6b15660.

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Zhang, Hui, Youshen Wu, Zhenhai Gan, Yuexuan Yang, Yiming Liu, Peng Tang i Daocheng Wu. "Accurate intracellular and in vivo temperature sensing based on CuInS2/ZnS QD micelles". Journal of Materials Chemistry B 7, nr 17 (2019): 2835–44. http://dx.doi.org/10.1039/c8tb03261k.

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We found that core–shell CuInS₂/ZnS QDs have obvious temperature dependence and they can be used for accurate intracellular and in vivo temperature sensing after being encapsulated by micelles, which exhibit high intracellular and in vivo thermal sensitivity.

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Zhang, Jian, Bowen Wang, Mike Tebyetekerwa, Yi Zhu, Boqing Liu, Hieu T. Nguyen, Shouqin Tian, Yupeng Zhang i Yuerui Lu. "Aluminium and zinc co-doped CuInS2 QDs for enhanced trion modulation in monolayer WS2 toward improved electrical properties". Journal of Materials Chemistry C 7, nr 47 (2019): 15074–81. http://dx.doi.org/10.1039/c9tc05469c.

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Singh, Dharmendra Pratap, Tripti Vimal, Yatin J. Mange, Mahesh C. Varia, Thomas Nann, K. K. Pandey, Rajiv Manohar i Redouane Douali. "CuInS2/ZnS QD-ferroelectric liquid crystal mixtures for faster electro-optical devices and their energy storage aspects". Journal of Applied Physics 123, nr 3 (21.01.2018): 034101. http://dx.doi.org/10.1063/1.5021474.

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Marin, Riccardo, Artiom Skripka, Yu-Cheng Huang, Tamie A. J. Loh, Viktoras Mazeika, Vitalijus Karabanovas, Daniel H. C. Chua, Chung-Li Dong, Patrizia Canton i Fiorenzo Vetrone. "Influence of halide ions on the structure and properties of copper indium sulphide quantum dots". Chemical Communications 56, nr 22 (2020): 3341–44. http://dx.doi.org/10.1039/c9cc08291c.

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Park, Soo Ik, Sung-Mok Jung, Jae-Yup Kim i Jiwoong Yang. "Effects of Mono- and Bifunctional Surface Ligands of Cu–In–Se Quantum Dots on Photoelectrochemical Hydrogen Production". Materials 15, nr 17 (31.08.2022): 6010. http://dx.doi.org/10.3390/ma15176010.

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Semiconductor nanocrystal quantum dots (QDs) are promising materials for solar energy conversion because of their bandgap tunability, high absorption coefficient, and improved hot-carrier generation. CuInSe2 (CISe)-based QDs have attracted attention because of their low toxicity and wide light-absorption range, spanning visible to near-infrared light. In this work, we study the effects of the surface ligands of colloidal CISe QDs on the photoelectrochemical characteristics of QD-photoanodes. Colloidal CISe QDs with mono- and bifunctional surface ligands are prepared and used in the fabrication of type-II heterojunction photoanodes by adsorbing QDs on mesoporous TiO2. QDs with monofunctional ligands are directly attached on TiO2 through partial ligand detachment, which is beneficial for electron transfer between QDs and TiO2. In contrast, bifunctional ligands bridge QDs and TiO2, increasing the amount of QD adsorption. Finally, photoanodes fabricated with oleylamine-passivated QDs show a current density of ~8.2 mA/cm2, while those fabricated with mercaptopropionic-acid-passivated QDs demonstrate a current density of ~6.7 mA/cm2 (at 0.6 VRHE under one sun illumination). Our study provides important information for the preparation of QD photoelectrodes for efficient photoelectrochemical hydrogen generation.

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Tang, Shin-Yi, Teng-Yu Su, Tzu-Yi Yang i Yu-Lun Chueh. "Novel Design of 0D Nanoparticles-2D Transition-Metal Dichalcogenides Heterostructured Devices for High-Performance Optical and Gas-Sensing Applications". ECS Meeting Abstracts MA2022-02, nr 36 (9.10.2022): 1318. http://dx.doi.org/10.1149/ma2022-02361318mtgabs.

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Two-dimensional Transition metal dichalcogenides (TMDCs), have now attracted much attention due to their unique layered structure and physical properties. Up to date, several studies have demonstrated monolayered and few-layered TMDC-based photodetectors with good stability, photo-switching time and broadband detectivity from UV to infrared light region. However, the reported responsivity is not as high as the theoretical expectation, indicating that the light absorption is limited by the atomic thickness of 2D-TMDCs and could still be improved. To overcome the drawback of low absorption in 2D TMDC materials, previous reports have revealed several strategies to enhance the electric field and light-harvesting in these atomically thin TMDC layers by hybridizing plasmonic noble-metal nanoparticles, such as Pt, Au and Ag, to facilitate the light-matter interaction at the surface of semiconductors. In this regard, we aim to combine highly absorptive CuInS2(CIS) nanocrystals with noble metal nanoparticles as the photosensitizer to enhance the intrinsic absorptivity and promote the performance of MoS2-based photodetectors. The interests of noble nanocrystals such as platinum and gold are featured for their distinctive properties of the carrier transportation and the storage when combined with semiconductor materials. The strategy described here acts as a perspective to signiﬁcantly improve the performance of MoS2-based photodetectors with outstanding detection responsivity with selectable wavelengths by further controlling the size and material of the decorated CIS nanocrystals. In addition to optical sensing, TMDCs have also been developed as a promising candidate for gas-molecule detection. Different from commercial metal oxide gas sensors, TMDCs as sensing materials can be operated at room temperature with good performance, increasing its reliability for future industrial applications. Nevertheless, the relatively low response and long response/recovery time are the main drawbacks of these promising devices. Therefore, we proposed the approach to successfully increase the surface area of TMDCs by a one-step synthesis from WO3 into three-dimensional (3D) WS2 nanowalls through a rapid heating and rapid cooling process. Moreover, the combination of CdS/ZnS or CdSe/ZnS core/shell quantum dots (QDs) with different emission wavelengths and WS2 nanowalls will further improve the performance of WS2-based photodetector devices, including 3.5~4.7 times photocurrent enhancement and shorter response time. The remarkable results of the QD-WS2 hybrid devices to the high non-radiative energy transfer (NRET) efficiency between QDs and our nanostructured material are caused by the spectral overlap between the emission of QDs as the donors and the absorption of WS2 as the acceptors. Additionally, the outstanding NO2 gas-sensing properties of QDs/WS2 devices were demonstrated with a remarkably low detection limit down to 50 ppb with a fast response time of 26.8 s, contributed by tremendous local p-n junctions generated from p-type WS2 nanowalls and n-type CdSe-ZnS QDs in this hybrid system. Our strategies to combine 0D nanoparticles or quantum dots and 2D TMDC materials can significantly enhance the optical sensing and gas molecule sensing properties compared to pristine TMDC-based devices, resulting from the efficient charge or energy transfer between the multi-dimension material system and the creation of local p-n junctions. Moreover, the scalability of these hybrid nanostructures allows our devices to exhibit much more possibilities in advanced multifunctional applications.

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Yang, Juan, Jingling Li, Yanqing Zhu, Xueqing Xu, Xiudi Xiao, Bing Deng, Kaili Qin, Zhuoneng Bi, Shuaijun Chen i Gang Xu. "Low-Temperature Synthesis of Highly Efficient, Deep-Red Zn-Cu-In-Se/ZnSe Fluorescence Quantum Dots". Nano 14, nr 06 (czerwiec 2019): 1950070. http://dx.doi.org/10.1142/s179329201950070x.

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We report a facile synthesis method on CuInSe2 (CISe)-based quantum dots (QDs) by using tri-[Formula: see text]-octylphosphine selenium (TOPSe) as selenide precursor, with assistance of oleylamine (OAm) and [Formula: see text]-dodecanethiol (DDT). We demonstrate that the OAm and DDT jointly contribute to the formation of the low-temperature-decomposable metal-sulfide clusters, and promote the QD nucleation at relatively low temperature range of 180–200∘C. Furthermore, to improve fluorescence property, Zn-doping and ZnSe coating are simultaneously carried out. The obtained deep-red ZnCISe/ZnSe QDs possess higher quantum yield of 65% at wavelength of 670[Formula: see text]nm, which is in the best performance range ever reported. Then, we investigate the improvement mechanism, where the sufficient Zn replacement of In sites is the crucial factor. This modified core–shell structure provides two benefits, on the one hand, the enhancement on intrinsic defect-related recombination, and the other hand, the improved core–shell interface that reduces the nonradiative recombination.

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Liu, Li, Yuan-Yuan Xiao, Yan-Hong Ji, Ming-Zhi Liu, Yao Chen, Yu-Lian Zeng, Yao-Guang Zhang i Li Jin. "CuInS 2 /ZnS QD exposure induces developmental toxicity, oxidative stress and DNA damage in rare minnow ( Gobiocypris rarus ) embryos and larvae". Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology 198 (sierpień 2017): 19–27. http://dx.doi.org/10.1016/j.cbpc.2017.04.009.

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Parrish, Charles H., Damon Hebert, Aaron Jackson, Karthik Ramasamy, Hunter McDaniel, Gene A. Giacomelli i Matthew R. Bergren. "Optimizing spectral quality with quantum dots to enhance crop yield in controlled environments". Communications Biology 4, nr 1 (27.01.2021). http://dx.doi.org/10.1038/s42003-020-01646-1.

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AbstractBioregenerative life-support systems (BLSS) involving plants will be required to realize self-sustaining human settlements beyond Earth. To improve plant productivity in BLSS, the quality of the solar spectrum can be modified by lightweight, luminescent films. CuInS2/ZnS quantum dot (QD) films were used to down-convert ultraviolet/blue photons to red emissions centered at 600 and 660 nm, resulting in increased biomass accumulation in red romaine lettuce. All plant growth parameters, except for spectral quality, were uniform across three production environments. Lettuce grown under the 600 and 660 nm-emitting QD films respectively increased edible dry mass (13 and 9%), edible fresh mass (11% each), and total leaf area (8 and 13%) compared with under a control film containing no QDs. Spectral modifications by the luminescent QD films improved photosynthetic efficiency in lettuce and could enhance productivity in greenhouses on Earth, or in space where, further conversion is expected from greater availability of ultraviolet photons.

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Rajendran, Jose Varghese, Sundararajan Parani, Vasudevan Pillay R. Remya, Thabang C. Lebepe, Rodney Maluleke, Olanrewaju A. Aladesuyi, Sabu Thomas i Oluwatobi Samuel Oluwafemi. "Preparation of β-Cyclodextrin Conjugated, Gelatin Stabilized SBA 15-CuInS2/ZnS Quantum Dot Nanocomposites for Camptothecin Release". Journal of Inorganic and Organometallic Polymers and Materials, 26.07.2023. http://dx.doi.org/10.1007/s10904-023-02801-x.

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AbstractCamptothecin (CPT) is a potential anticancer drug. However, it faces challenges due to its poor water solubility and the need for an efficient drug release system. Herein, we developed a novel system composed of gelatin stabilized, mesoporous silica SBA15 encapsulated CuInS2/ZnS (CIS/ZnS) quantum dots (QDs) conjugated with β-cyclodextrin (β-CDs) for its potential use in the release of CPT. In this multifunctional system, β-CDs served as the drug carrier, SBA15 encapsulated QDs is capable of imaging and the gelatin was used to enhance the carrier-drug interaction. Fourier transform infrared (FTIR) analysis confirmed the successful conjugation of β-CDs to the Gel-SBA15 CIS/ZnS QDs, while optical analyses revealed excellent emission properties and high photostability. The β-CD-conjugated Gel-SBA15-CIS/ZnS QD nanocomposite was used to obtain the soluble derivate of CPT which further demonstrated a drug release profile following the triphasic model. Overall, the improved photostability and acceptable drug release profile of the β-CD conjugated Gel-SBA15-CIS/ZnS QD nanocomposite hold great promise for both imaging and therapeutic applications. Graphical Abstract

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Ko, Minji, Soyeon Yoon, Yun Jae Eo, Keyong Nam Lee i Young Rag Do. "Passivation and Interlayer Effect of Zr(i-PrO)4 on Green CuGaS2/ZnS/Zr(i-PrO)4@Al2O3 and Red CuInS2/ZnS/Zr(i-PrO)4@Al2O3 QD Hybrid Powders". Nanoscale Research Letters 17, nr 1 (7.11.2022). http://dx.doi.org/10.1186/s11671-022-03741-0.

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AbstractBroadband emissive I–III–VI quantum dots (QDs) are synthesized as efficient and stable I–III–VI QDs to be used as eco-friendly luminescent materials in various applications. Here, we introduce the additional passivation of zirconium isopropoxide (Zr(i-PrO)4) to improve the optical properties and environmental stability of green-emitting CuGaS2/ZnS (G-CGS/ZnS) and red-emitting CuInS2/ZnS (R-CIS/ZnS) QDs. The photoluminescence quantum yield (PLQY) of both resultant Zr(i-PrO)4-coated G-CGS/ZnS and R-CIS/ZnS QDs reaches similar values of ~ 95%. In addition, the photostability and thermal-stability of G-CGS/ZnS/Zr(i-PrO)4 and R-CIS/ZnS/Zr(i-PrO)4 QDs are improved by reducing the ligand loss via encapsulation of the ligand-coated QD surface with Zr(i-PrO)4. It is also proved that the Zr(i-PrO)4-passivated interlayer mitigates the further degradation of I-III-V QDs from ligand loss even under harsh conditions during additional hydrolysis reaction of aluminum tri-sec-butoxide (Al(sec-BuO)3), forming easy-to-handle G-CGS/ZnS and R-CIS/ZnS QD-embedded Al2O3 powders. Therefore, the introduction of a Zr(i-PrO)4 complex layer potentially provides a strong interlayer to mitigate degradation of I–III–VI QD-embedded Al2O3 hybrid powders as well as passivation layer for protecting I–III–VI QD.

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Aldaz‐Caballero, Leyre, Ulises R. Rodríguez‐Mendoza, Víctor Lavín, Patrizia Canton, Antonio Benayas i Riccardo Marin. "Copper Indium Sulfide Quantum Dots as Nanomanometers: Influence of Size and Composition". Advanced Sensor Research, 31.08.2023. http://dx.doi.org/10.1002/adsr.202300078.

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AbstractMechanical forces control the function of organisms and mediate the interaction between biological systems and their environments. Knowledge of these forces will increase the understanding of biological processes and can support the development of novel diagnostic and therapeutic procedures. Although techniques like atomic force microscopy and droplet insertion method allow measuring forces over a broad range of values, they are invasive and lack versatility. A promising way to overcome these hurdles is luminescent nanomanometry. Quantum dots (QDs) specifically have optical properties that depend on their size because of the quantum confinement, which makes them responsive to applied forces. Yet, a fine understanding of how fundamental parameters affect the response to applied stress is required before a QD family can be credibly proposed as luminescent nanomanometers. Here, a thorough study is conducted on how size and stoichiometry affect the nanomanometry performance of CuInS2 QDs. The studied QDs feature pressure‐dependent photoluminescence in the red/near‐infrared range, which can enable the measurement of mechanical forces in the range of physiological relevance in a remote and minimally invasive way. It is shown that tuning size and stoichiometry can simultaneously enhance the CuInS2 QDs’ brightness and response to applied pressure, thus providing guidelines for better luminescent nanomanometers.

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Landi, Brian J., Stephanie L. Castro, Chris M. Evans, Herbert J. Ruf, Sheila G. Bailey i Ryne P. Raffaelle. "Quantum Dot-Single Wall Carbon Nanotube Complexes for Polymeric Photovoltaics". MRS Proceedings 836 (2004). http://dx.doi.org/10.1557/proc-836-l2.8.

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ABSTRACTThe ability to dissociate the photo-generated excitons and transport the resulting charge carriers are the major impediments in improving the efficiency of polymeric solar cells. In order to simultaneously address both of these issues, we have investigated the use of quantum dotsingle wall carbon nanotube (QD-SWNT) complexes as a suitable nanomaterial dopant in these devices. The formation of CdSe-SWNT complexes occurred through covalent attachment of carboxylic acid-functionalized SWNTs with CdSe-aminoethanethiol (AET) quantum dots. An additional synthetic approach was evaluated using both electrostatic and covalent attachment schemes for CuInS2-mercaptoacetic acid (MA) quantum dots and amine terminated SWNTs. The efficacy of each approach is discussed, including the necessary transmission electron microscopy (TEM) and optical absorption spectroscopy data to probe the interactions between nanomaterials. The potential effects of charge transfer between components may have important implications in the efficiency of these materials for polymeric photovoltaic devices.

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Artykuły w czasopismach na temat „CuInS2 QD”

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