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Artículos de revistas sobre el tema "Chalcogenide quantum dots"

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Autor: Grafiati

Publicado: 13 de abril de 2024

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1

Hao, Qun, Haifei Ma, Xida Xing, Xin Tang, Zhipeng Wei, Xue Zhao y Menglu Chen. "Mercury Chalcogenide Colloidal Quantum Dots for Infrared Photodetectors". Materials 16, n.º 23 (24 de noviembre de 2023): 7321. http://dx.doi.org/10.3390/ma16237321.

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In recent years, mercury chalcogenide colloidal quantum dots (CQDs) have attracted widespread research interest due to their unique electronic structure and optical properties. Mercury chalcogenide CQDs demonstrate an exceptionally broad spectrum and tunable light response across the short-wave to long-wave infrared spectrum. Photodetectors based on mercury chalcogenide CQDs have attracted considerable attention due to their advantages, including solution processability, low manufacturing costs, and excellent compatibility with silicon substrates, which offers significant potential for applications in infrared detection and imaging. However, practical applications of mercury-chalcogenide-CQD-based photodetectors encounter several challenges, including material stability, morphology control, surface modification, and passivation issues. These challenges act as bottlenecks in further advancing the technology. This review article delves into three types of materials, providing detailed insights into the synthesis methods, control of physical properties, and device engineering aspects of mercury-chalcogenide-CQD-based infrared photodetectors. This systematic review aids researchers in gaining a better understanding of the current state of research and provides clear directions for future investigations.

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2

Gelchuk, Y., O. Boreiko, G. Okrepka y Yu Khalavka. "Synthesis and optical properties of AgInS2 nanoparticles". Chernivtsi University Scientific Herald. Chemistry, n.º 818 (2019): 12–19. http://dx.doi.org/10.31861/chem-2019-818-02.

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Ternary chalcogenide Ag-In quantum dots (QDs) are more environmentally friendly than known Cd-, Pb- and P-containing nanoparticles. Here we review the literature on colloidal synthesis methods, properties, and promising fields for the application of AgInS2 quantum dots. Similar to the QDs of lead and cadmium chalcogenides, the most accurate control over the structure and morphology of AgInS2 QDs is achieved by using the method of introducing precursors into high-boiling organic solvents. However, to realize the potential applications of ternary quantum dots, in particular as luminescent biomarkers, the quantum dots must be soluble in polar solvents, especially water. The transfer of quantum dots into aqueous solutions is usually accomplished by exchanging primary lyophilic ligands with smaller bifunctional molecules, such as thioglycolic (or mercaptopropionic) acids, which can passivate the surface of the quantum dots while making them soluble in the polar environment. Methods of colloidal synthesis of AgInS2 / ZnS quantum dots can be classified into the following types: Injection of ions into a high-boiling solvent Synthesis in a mixture of solvents Synthesis in the aquatic environment Methods for the synthesis of AgInS2 QDs in both aqueous solution and organic solvent medium are described. Examples of application of quantum dots for biomedical purposes and in photovoltaic and sensory devices are given. Quantum dots have high photostability and brightness, are characterized by a wide range of absorption and narrow spectral bands of radiation, ie meet most of the criteria for fluorescent materials and biosensors for imaging cancer cells in antitumor therapy, immunofluorescent labeling of proteins, detection of toxins s, visualize intracellular structures, etc. Quantum dots of tertiary chalcogenides, in particular CuInS2 and AgInS2, may be an alternative to quantum dots of binary lead and cadmium chalcogenides for use in light-emitting and light-absorbing systems, such as LEDs, sensors and solar absorbers.

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3

Mal, J., Y. V. Nancharaiah, E. D. van Hullebusch y P. N. L. Lens. "Metal chalcogenide quantum dots: biotechnological synthesis and applications". RSC Advances 6, n.º 47 (2016): 41477–95. http://dx.doi.org/10.1039/c6ra08447h.

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4

Green, Mark y Hassan Mirzai. "Synthetic routes to mercury chalcogenide quantum dots". Journal of Materials Chemistry C 6, n.º 19 (2018): 5097–112. http://dx.doi.org/10.1039/c8tc00910d.

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In this report, we explore the synthetic chemistry behind the development of mercury chalcogenide quantum dots and highlight some key optical properties. Graphical abstract shows a HgTe quantum dots. Reproduced from M. Green, G. Wakefield and P. J. Dobson,J. Mater. Chem., 2003,13, 1076 with permission from The Royal Society of Chemistry.

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5

Lukose, Binit y Paulette Clancy. "A feasibility study of unconventional planar ligand spacers in chalcogenide nanocrystals". Physical Chemistry Chemical Physics 18, n.º 20 (2016): 13781–93. http://dx.doi.org/10.1039/c5cp07521a.

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The solar cell efficiency of chalcogenide nanocrystals (quantum dots) has been limited in the past by the insulation between neighboring quantum dots caused by intervening, often long-chain, aliphatic ligands.

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6

Chen, Yuetian y Yixin Zhao. "Incorporating quantum dots for high efficiency and stable perovskite photovoltaics". Journal of Materials Chemistry A 8, n.º 47 (2020): 25017–27. http://dx.doi.org/10.1039/d0ta09096d.

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7

Shuklov, I. A. y V. F. Razumov. "Lead chalcogenide quantum dots for photoelectric devices". Russian Chemical Reviews 89, n.º 3 (28 de febrero de 2020): 379–91. http://dx.doi.org/10.1070/rcr4917.

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8

YAGCI ACAR, Funda. "Theranostic Silver Chalcogenide Quantum Dots in Phototherapy". Photodiagnosis and Photodynamic Therapy 41 (marzo de 2023): 103397. http://dx.doi.org/10.1016/j.pdpdt.2023.103397.

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9

Li, Xiu-Ping, Rong-Jin Huang, Cong Chen, Tianduo Li y Yu-Ji Gao. "Simultaneous Conduction and Valence Band Regulation of Indium-Based Quantum Dots for Efficient H2 Photogeneration". Nanomaterials 11, n.º 5 (26 de abril de 2021): 1115. http://dx.doi.org/10.3390/nano11051115.

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Indium-based chalcogenide semiconductors have been served as the promising candidates for solar H2 evolution reaction, however, the related studies are still in its infancy and the enhancement of efficiency remains a grand challenge. Here, we report that the photocatalytic H2 evolution activity of quantized indium chalcogenide semiconductors could be dramatically aroused by the co-decoration of transition metal Zn and Cu. Different from the traditional metal ion doping strategies which only focus on narrowing bandgap for robust visible light harvesting, the conduction and valence band are coordinately regulated to realize the bandgap narrowing and the raising of thermodynamic driving force for proton reduction, simultaneously. Therefore, the as-prepared noble metal-free Cu0.4-ZnIn2S4 quantum dots (QDs) exhibits extraordinary activity for photocatalytic H2 evolution. Under optimal conditions, the Cu0.4-ZnIn2S4 QDs could produce H2 with the rate of 144.4 μmol h−1 mg−1, 480-fold and 6-fold higher than that of pristine In2S3 QDs and Cu-doped In2S3 QDs counterparts respectively, which is even comparable with the state-of-the-art cadmium chalcogenides QDs.

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10

Sun, Jianhui, Michio Ikezawa, Xiuying Wang, Pengtao Jing, Haibo Li, Jialong Zhao y Yasuaki Masumoto. "Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots". Physical Chemistry Chemical Physics 17, n.º 18 (2015): 11981–89. http://dx.doi.org/10.1039/c5cp00034c.

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Photocarrier recombination dynamics in ternary chalcogenide CuInS₂ quantum dots (CIS QDs) was studied by means of femtosecond transient-absorption (TA) and nanosecond time-resolved photoluminescence (PL) spectroscopy.

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11

Zhao, Xue, Haifei Ma, Hongxing Cai, Zhipeng Wei, Ying Bi, Xin Tang y Tianling Qin. "Lead Chalcogenide Colloidal Quantum Dots for Infrared Photodetectors". Materials 16, n.º 17 (24 de agosto de 2023): 5790. http://dx.doi.org/10.3390/ma16175790.

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Infrared detection technology plays an important role in remote sensing, imaging, monitoring, and other fields. So far, most infrared photodetectors are based on InGaAs and HgCdTe materials, which are limited by high fabrication costs, complex production processes, and poor compatibility with silicon-based readout integrated circuits. This hinders the wider application of infrared detection technology. Therefore, reducing the cost of high-performance photodetectors is a research focus. Colloidal quantum dot photodetectors have the advantages of solution processing, low cost, and good compatibility with silicon-based substrates. In this paper, we summarize the recent development of infrared photodetectors based on mainstream lead chalcogenide colloidal quantum dots.

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12

Lu, Kunyuan, Yongjie Wang, Jianyu Yuan, Zequn Cui, Guozheng Shi, Shaohua Shi, Lu Han et al. "Efficient PbS quantum dot solar cells employing a conventional structure". Journal of Materials Chemistry A 5, n.º 45 (2017): 23960–66. http://dx.doi.org/10.1039/c7ta07014d.

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13

Bhardwaj, Karishma, Sajan Pradhan, Siddhant Basel, Mitchell Clarke, Beatriz Brito, Surakcha Thapa, Pankaj Roy et al. "Tunable NIR-II emitting silver chalcogenide quantum dots using thio/selenourea precursors: preparation of an MRI/NIR-II multimodal imaging agent". Dalton Transactions 49, n.º 43 (2020): 15425–32. http://dx.doi.org/10.1039/d0dt02974b.

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14

Hewa-Rahinduwage, Chathuranga C., Xin Geng, Karunamuni L. Silva, Xiangfu Niu, Liang Zhang, Stephanie L. Brock y Long Luo. "Reversible Electrochemical Gelation of Metal Chalcogenide Quantum Dots". Journal of the American Chemical Society 142, n.º 28 (3 de junio de 2020): 12207–15. http://dx.doi.org/10.1021/jacs.0c03156.

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15

Jiang, Peng, Dong-Liang Zhu, Chun-Nan Zhu, Zhi-Ling Zhang, Guo-Jun Zhang y Dai-Wen Pang. "A highly reactive chalcogenide precursor for the synthesis of metal chalcogenide quantum dots". Nanoscale 7, n.º 45 (2015): 19310–16. http://dx.doi.org/10.1039/c5nr05747g.

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16

Gréboval, Charlie, Audrey Chu, Nicolas Goubet, Clément Livache, Sandrine Ithurria y Emmanuel Lhuillier. "Mercury Chalcogenide Quantum Dots: Material Perspective for Device Integration". Chemical Reviews 121, n.º 7 (1 de marzo de 2021): 3627–700. http://dx.doi.org/10.1021/acs.chemrev.0c01120.

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17

Grisorio, Roberto, Danila Quarta, Angela Fiore, Luigi Carbone, Gian Paolo Suranna y Carlo Giansante. "The dynamic surface chemistry of colloidal metal chalcogenide quantum dots". Nanoscale Advances 1, n.º 9 (2019): 3639–46. http://dx.doi.org/10.1039/c9na00452a.

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18

Hewa-Rahinduwage, Chathuranga C., Karunamuni L. Silva, Xin Geng, Stephanie L. Brock y Long Luo. "Electrochemical gelation of quantum dots using non-noble metal electrodes at high oxidation potentials". Nanoscale 13, n.º 48 (2021): 20625–36. http://dx.doi.org/10.1039/d1nr06615c.

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Relative to conventional chemical approaches, electrochemical assembly of metal chalcogenide nanoparticles enables the use of two additional levers for tuning the assembly process: electrode material and potential.

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19

Das, S. y K. C. Mandal. "Optical Down-Conversion in Tb3+-Doped Zn-Chalcogenide Quantum Dots". ECS Transactions 45, n.º 5 (27 de abril de 2012): 89–94. http://dx.doi.org/10.1149/1.3700414.

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20

Bhandari, Satyapriya, Shilaj Roy, Sabyasachi Pramanik y Arun Chattopadhyay. "Chemical Reactions Involving the Surface of Metal Chalcogenide Quantum Dots". Langmuir 35, n.º 45 (9 de julio de 2019): 14399–413. http://dx.doi.org/10.1021/acs.langmuir.9b01285.

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21

Mareeswari, P., J. Brijitta, S. Harikrishna Etti, C. Meganathan y Gobi Saravanan Kaliaraj. "Rhizopus stolonifer mediated biosynthesis of biocompatible cadmium chalcogenide quantum dots". Enzyme and Microbial Technology 95 (diciembre de 2016): 225–29. http://dx.doi.org/10.1016/j.enzmictec.2016.08.016.

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22

Yordanov, Georgi G., Hideyuki Yoshimura y Ceco D. Dushkin. "Phosphine-free synthesis of metal chalcogenide quantum dots by means of in situ-generated hydrogen chalcogenides". Colloid and Polymer Science 286, n.º 6-7 (13 de febrero de 2008): 813–17. http://dx.doi.org/10.1007/s00396-008-1840-z.

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23

Bertolotti, Federica, Dmitry N. Dirin, Maria Ibáñez, Frank Krumeich, Antonio Cervellino, Ruggero Frison, Oleksandr Voznyy et al. "Crystal symmetry breaking and vacancies in colloidal lead chalcogenide quantum dots". Nature Materials 15, n.º 9 (13 de junio de 2016): 987–94. http://dx.doi.org/10.1038/nmat4661.

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24

Han, Na, Chao Liu, Zhiyong Zhao, Jihong Zhang, Jun Xie, Jianjun Han, Xiujian Zhao y Yang Jiang. "Quantum Dots in Glasses: Size-Dependent Stokes Shift by Lead Chalcogenide". International Journal of Applied Glass Science 6, n.º 4 (6 de agosto de 2015): 339–44. http://dx.doi.org/10.1111/ijag.12138.

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25

Arachchige, Indika U. y Stephanie L. Brock. "Sol–Gel Methods for the Assembly of Metal Chalcogenide Quantum Dots". Accounts of Chemical Research 40, n.º 9 (septiembre de 2007): 801–9. http://dx.doi.org/10.1021/ar600028s.

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26

Spirin, M. G., S. B. Brichkin y V. F. Razumov. "Phosphonic acids as stabilizing ligands for cadmium chalcogenide colloidal quantum dots". Russian Chemical Bulletin 65, n.º 8 (agosto de 2016): 1902–9. http://dx.doi.org/10.1007/s11172-016-1531-8.

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27

Jin, Xiao, Weifu Sun, Shenglian Luo, Liping Shao, Jian Zhang, Xubiao Luo, Taihuei Wei, Yuancheng Qin, Yinglin Song y Qinghua Li. "Energy gradient architectured praseodymium chalcogenide quantum dot solar cells: towards unidirectionally funneling energy transfer". Journal of Materials Chemistry A 3, n.º 47 (2015): 23876–87. http://dx.doi.org/10.1039/c5ta06447c.

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By sequentially layering quantum dots, rainbow quadruple-stack junctions with energy gradient architecture are constructed. Efficient charge energy transfer occurs in the multilayer, thus leading to a significant enhancement in photovoltaic performances of quantum dot solar cells.

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28

Neves, Márcia C., Angela S. Pereira, Marco Peres, Andréi L. Kholkin, Teresa Monteiro y Tito Trindade. "Layer-by-Layer Deposition of Organically Capped Quantum Dots". Materials Science Forum 514-516 (mayo de 2006): 1111–15. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.1111.

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Cadmium chalcogenide quantum dots (QD’s) were synthesised using a single source approach while zinc oxide QD’s were obtained by a colloidal technique. In both situations the dots were surface capped with tri-octylphosphine oxide (TOPO) hence leading to nanodispersed systems in organic solvents such as toluene. The organically capped QD’s (CdSe, CdS and ZnO) were used as building-units to fabricate LbL (layer-by-layer) films on glass and quartz substrates. A linear increase in the visible light absorbance (due to the QD’s) with the number of deposited layers indicates that multi-layered systems have been fabricated. In order to investigate the effect of the LbL manipulation on the integrity of the QD’s, comparative studies on the optical properties of the starting QD’s and the nanostructured films have been performed. The observation of quantum size effects in both cases suggests minimal degradation of the QD’s though clustering had probably occurred, a point which was further confirmed by AFM analysis.

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29

Novak, Spencer, Luca Scarpantonio, Jacklyn Novak, Marta Dai Prè, Alessandro Martucci, Jonathan D. Musgraves, Nathan D. McClenaghan y Kathleen Richardson. "Incorporation of luminescent CdSe/ZnS core-shell quantum dots and PbS quantum dots into solution-derived chalcogenide glass films". Optical Materials Express 3, n.º 6 (6 de mayo de 2013): 729. http://dx.doi.org/10.1364/ome.3.000729.

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30

Hao Qun, 郝群, 唐鑫 Tang Xin y 陈梦璐 Chen Menglu. "硫汞族量子点红外光电探测技术". Acta Optica Sinica 43, n.º 15 (2023): 1500001. http://dx.doi.org/10.3788/aos230963.

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31

Alvi, M. A., A. A. Al-Ghamdi y M. Zulfequar. "Synthesis and Characterization of Cadmium Chalcogenide Semiconductor Quantum Dots Based Thin Film". Journal of Nanoelectronics and Optoelectronics 11, n.º 5 (1 de octubre de 2016): 656–61. http://dx.doi.org/10.1166/jno.2016.1938.

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32

Justo, Yolanda, Iwan Moreels, Karel Lambert y Zeger Hens. "Langmuir–Blodgett monolayers of colloidal lead chalcogenide quantum dots: morphology and photoluminescence". Nanotechnology 21, n.º 29 (5 de julio de 2010): 295606. http://dx.doi.org/10.1088/0957-4484/21/29/295606.

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33

Hu, Jinming, Yuansheng Shi, Zhenheng Zhang, Ruonan Zhi, Shengyi Yang y Bingsuo Zou. "Recent progress of infrared photodetectors based on lead chalcogenide colloidal quantum dots". Chinese Physics B 28, n.º 2 (febrero de 2019): 020701. http://dx.doi.org/10.1088/1674-1056/28/2/020701.

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34

De Freitas, Jilian N., Lasantha Korala, Luke X. Reynolds, Saif A. Haque, Stephanie L. Brock y Ana F. Nogueira. "Connecting the (quantum) dots: towards hybrid photovoltaic devices based on chalcogenide gels". Physical Chemistry Chemical Physics 14, n.º 43 (2012): 15180. http://dx.doi.org/10.1039/c2cp42998e.

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35

Schnitzenbaumer, Kyle J., Tais Labrador y Gordana Dukovic. "Impact of Chalcogenide Ligands on Excited State Dynamics in CdSe Quantum Dots". Journal of Physical Chemistry C 119, n.º 23 (26 de mayo de 2015): 13314–24. http://dx.doi.org/10.1021/acs.jpcc.5b02880.

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36

Kahmann, Simon y Maria A. Loi. "Trap states in lead chalcogenide colloidal quantum dots—origin, impact, and remedies". Applied Physics Reviews 7, n.º 4 (diciembre de 2020): 041305. http://dx.doi.org/10.1063/5.0019800.

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37

Greytak, Andrew B. "(Invited) Ligand Exchange at Chalcogenide and Perovskite Nanocrystal Surfaces Examined Via Isothermal Titration Calorimetry". ECS Meeting Abstracts MA2022-02, n.º 20 (9 de octubre de 2022): 905. http://dx.doi.org/10.1149/ma2022-0220905mtgabs.

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I will describe our group’s efforts to quantify ligand association and exchange reactions on semiconductor nanocrystal (NC) surfaces via isothermal titration calorimetry (ITC). ITC provides a direct thermal measurement of reaction progress. As shown in earlier work by our group and others examining ligand exchange on chalcogenide and pnictide quantum dots, ITC is able to access the enthalpy change of reaction, equivalency, and effective equilibrium constants, including in cases that are challenging to resolve by NMR alone. Here, we will describe the extension of this approach to ligand exchange reactions on halide perovskite NCs, and to ligand exchange on chalcogenide NCs in aqueous solution. Such advances are needed to contribute a quantitative description of NC surface chemistry toward applications such as advanced optoelectronic devices, bioimaging probes, and photocatalysis.

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38

Jeong, Kwang Seob. "(Invited) Optical and Electrical Property of Self-doped Silver Chalcogenide Colloidal Quantum Dots". ECS Meeting Abstracts MA2021-01, n.º 23 (30 de mayo de 2021): 901. http://dx.doi.org/10.1149/ma2021-0123901mtgabs.

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39

Liu, Haochen, Huaying Zhong, Fankai Zheng, Yue Xie, Depeng Li, Dan Wu, Ziming Zhou, Xiao-Wei Sun y Kai Wang. "Near-infrared lead chalcogenide quantum dots: Synthesis and applications in light emitting diodes". Chinese Physics B 28, n.º 12 (diciembre de 2019): 128504. http://dx.doi.org/10.1088/1674-1056/ab50fa.

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40

Smith, Danielle K., Joseph M. Luther, Octavi E. Semonin, Arthur J. Nozik y Matthew C. Beard. "Tuning the Synthesis of Ternary Lead Chalcogenide Quantum Dots by Balancing Precursor Reactivity". ACS Nano 5, n.º 1 (8 de diciembre de 2010): 183–90. http://dx.doi.org/10.1021/nn102878u.

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41

Cheruvathoor Poulose, Aby, Srivani Veeranarayanan, M. Sheikh Mohamed, Sreejith Raveendran, Yutaka Nagaoka, Yasuhiko Yoshida, Toru Maekawa y D. Sakthi Kumar. "PEG Coated Biocompatible Cadmium Chalcogenide Quantum Dots for Targeted Imaging of Cancer Cells". Journal of Fluorescence 22, n.º 3 (8 de enero de 2012): 931–44. http://dx.doi.org/10.1007/s10895-011-1032-y.

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42

Chand, Subhash, Nagesh Thakur, S. C. Katyal, P. B. Barman, Vineet Sharma y Pankaj Sharma. "Recent developments on the synthesis, structural and optical properties of chalcogenide quantum dots". Solar Energy Materials and Solar Cells 168 (agosto de 2017): 183–200. http://dx.doi.org/10.1016/j.solmat.2017.04.033.

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43

Gui, Rijun, Hui Jin, Zonghua Wang y Lianjiang Tan. "Recent advances in synthetic methods and applications of colloidal silver chalcogenide quantum dots". Coordination Chemistry Reviews 296 (julio de 2015): 91–124. http://dx.doi.org/10.1016/j.ccr.2015.03.023.

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44

Cass, Laura C., Nathaniel K. Swenson y Emily A. Weiss. "Electronic and Vibrational Structure of Complexes of Tetracyanoquinodimethane with Cadmium Chalcogenide Quantum Dots". Journal of Physical Chemistry C 118, n.º 31 (24 de julio de 2014): 18263–70. http://dx.doi.org/10.1021/jp505986c.

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45

Yumashev, K. V., V. S. Gurin, P. V. Prokoshin, V. B. Prokopenko y A. A. Alexeenko. "Nonlinear Optical Properties and Laser Applications of Copper Chalcogenide Quantum Dots in Glass". physica status solidi (b) 224, n.º 3 (abril de 2001): 815–18. http://dx.doi.org/10.1002/(sici)1521-3951(200104)224:3<815::aid-pssb815>3.0.co;2-h.

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46

Irmania, Novi, Khalilalrahman Dehvari y Jia-Yaw Chang. "Multifunctional MnCuInSe/ZnS quantum dots for bioimaging and photodynamic therapy". Journal of Biomaterials Applications 36, n.º 9 (21 de febrero de 2022): 1617–28. http://dx.doi.org/10.1177/08853282211068959.

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In this work, manganese (Mn)-doped CuInSe quantum dots (QDs) with a ZnS passivation layer (MnCuInSe/ZnS) have been synthesized via a one-pot microwave-assisted hydrothermal reaction using glutathione (GSH) as a stabilizer. The MnCuInSe/ZnS core-shell QDs combine magnetic resonance imaging (MRI), excitation-dependent red emission, and reactive oxygen radical generation functions, in which regulation of Mn2+ incorporation leads to synergistic imaging and therapeutic modalities. The MnCuInSe/ZnS QDs exhibit high colloidal and photochemical stability in simulated media and at different pH values. An r2/r1 ratio of 9.99 was calculated from MRI studies suggesting their potential application as dual-modal imaging agents. Based on in vitro tests on Hela, B16, and HepG2 cell lines, it is apparent that MnCuInSe/ZnS QDs impose no significant cytotoxicity in the dark, while they can efficiently generate singlet oxygen radicals for photodynamic therapy of cancers, killing more than 80% of B16 cells within 5 min of laser irradiation (671 nm, 1 W cm−2). Furthermore, in vitro fluorescence imaging and cellular internalization of QDs are examined to visualize cellular uptake and in situ ROS generation. Therefore, this research exemplifies a new set of multifunctional chalcogenide QDs for theranostic applications.

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47

AHAMED, M. I., K. S. KUMAR, E. E. ANAND y A. SIVARANJANI. "OPTICAL ATTENUATION MODELLING OF PbSexS1-x QUANTUM DOTS WITH VEGARD'S LAW AND BRUS EQUATION USE". Journal of Ovonic Research 16, n.º 4 (julio de 2020): 245–52. http://dx.doi.org/10.15251/jor.2020.164.245.

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Lead Selenide Sulphide (PbSeS) nanomaterial, a chalcogenide semiconductor which has maximum radiation attenuation can be tuned for required wavelength in the range from ultraviolet to infrared. Hence it has received much interest among researchers. Further, the electronical and optical properties of PbSeS Quantum Dots were modeled by Brus Equation, Vegard’s law and Interpolation principle calculations. Therefore, in this paper, we have studied the progress and structural parameters of PbSeS at different energy band gap and wavelength. The obtained results confirms that the attenuation of radiation versus wavelength is inversely proportional to the bandgap and also the mole fraction of lead increases with decrease in energy band gap. These findings confirm the quantum effects of the material and which can be utilized in solar cell and optoelectronics applications. The results are compared with available experimental data that supports the validity of the model reported.

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Babu, P. J. S., T. S. Padmanabhan, M. I. Ahamed y A. Sivaranjani. "Studies on copper indium selenide/Zinc sulphide semiconductor quantum dots for solar cell applications". Chalcogenide Letters 18, n.º 11 (noviembre de 2021): 701–15. http://dx.doi.org/10.15251/cl.2021.1811.701.

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Despite dedicated efforts to develop efficient quantum dot sensitized (QDS) photovoltaic cells, the efficiency of these cells still lags behind their theoretical value. In order to increase photo conversion efficiency, the extant methods are predominantly focus on modifying the band gaps of quantum dots and optimizing the interfaces of cell components to increase light utilization capacity. In this study, we have designed and investigated QDS solar cells using Copper Indium Selenide (CuInSe2 or simply CIS) as a quantum dot absorber. In order to achieve tunable bandgap, increased photoluminescence, reduced density of surface defect state and higher light-harvesting efficiency, the CuInSe2 is alloying with Zinc sulfide (ZnS) to design Copper Indium Selenide-Zinc sulfide (CISZS) quantum dots. The resulting CISZS sensitizer exhibits improved photoelectric characteristics and greater chemical stability. The performance of the CIS and CISZS solar cells is evaluated individually through Silvaco-Atlas simulation software in terms of measures such as power conversion efficiency, open-circuit voltage (Voc), the density of short-circuit current (Jsc) and fill-factor (FF). The CISZS-based solar cells show an average conversion efficiency of 23.5% (i.e., 4.94% higher than the efficiency of CIS solar cell) with Voc = 0.596V, Jsc = 23.61mA/cm2 and FF = 0.84 under AM 1.5G with a power density of 100mW/cm2 . The achieved power conversion efficiency indicates the greatest performances of the QDS solar cells. These non-toxic photovoltaic devices reveal better optical and electrical properties than toxic lead and cadmium chalcogenide quantum dots absorbers.

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Louh, Rong Fuh, Alex C. C. Chang, Rex Wang y C. H. Hsiao. "Photoluminescence Response and Particle Size Control of CdSe Quantum Dots by Wet Chemical Synthesis for Biomedical Applications". Advances in Science and Technology 57 (septiembre de 2008): 37–43. http://dx.doi.org/10.4028/www.scientific.net/ast.57.37.

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The chalcogenide CdSe quantum dots (QDs) were obtained by wet chemical synthesis route, using cadmium oxide and pure selenium as precursors, hexadecylamine (HDA), tetradecylphosphine oxide (TDPO) and tri-n-octylphosphine oxide (TOPO) as complexing agents in tri-n-butylphosphine (TBP) solvent in the reactor with an argon protection atmosphere. This study aims at manipulating the size of QDs for the potential in vivo medical applications. The CdSe nanoparticles were analyzed by particle size analyzer, photoluminescence (PL) spectroscopy, FE-SEM, TEM, and XPS. The desired particle size and photoluminescence response of CdSe QDs can be achieved by adjusting proper molar ratios of HDA/TOPO and CdO/Se, along with the synthesis temperature and reaction time. Our results show that the obtained CdSe quantum dots have the average particle size of 1~10 nm within a size variation of 1.5 nm. The resultant CdSe QDs provide stable PL responses as excited by light sources of 388~550 nm wavelengths.

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Giansante, Carlo. "Enhancing light absorption by colloidal metal chalcogenide quantum dots via chalcogenol(ate) surface ligands". Nanoscale 11, n.º 19 (2019): 9478–87. http://dx.doi.org/10.1039/c9nr01785b.

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