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Copper-indium-selenide quantum dot-sensitized solar cells

Cited 41 time in Web of Science Cited 44 time in Scopus
Authors
Yang, Jiwoong; Kim, Jae-Yup; Yu, Jung Ho; Ahn, Tae-Young; Lee, Hyunjae; Choi, Tae-Seok; Kim, Young-Woon; Joo, Jin; Ko, Min Jae; Hyeon, Taeghwan
Issue Date
2013-12
Citation
Physical Chemistry Chemical Physics, Vol.15 No.47, pp.20517-20525
Abstract
We present a new synthetic process of near infrared (NIR)-absorbing copper-indium-selenide (CISe) quantum dots (QDs) and their applications to efficient and completely heavy-metal-free QD-sensitized solar cells (QDSCs). Lewis acid-base reaction of metal iodides and selenocarbamate enabled us to produce chalcopyrite-structured CISe QDs with controlled sizes and compositions. Furthermore, gram-scale production of CISe QDs was achieved with a high reaction yield of similar to 73%, which is important for the commercialization of low-cost photovoltaic (PV) devices. By changing the size and composition, electronic band alignment of CISe QDs could be finely tuned to optimize the energetics of the effective light absorption and injection of electrons into the TiO2 conduction band (CB). These energy-band-engineered QDs were applied to QDSCs, and the quantum-confinement effect on the PV performances was clearly demonstrated. Our best cell yielded a conversion efficiency of 4.30% under AM1.5G one sun illumination, which is comparable to the performance of the best solar cells based on toxic lead chalcogenide or cadmium chalcogenide QDs.
ISSN
1463-9076
URI
https://hdl.handle.net/10371/171762
DOI
https://doi.org/10.1039/c3cp54270j
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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