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 2024-01-20T11:02:44Z 2024-01-20T11:02:44Z 2021-08-31 2013-12 1463-9076 https://pubs.kist.re.kr/handle/201004/127417 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. English ROYAL SOC CHEMISTRY MULTIPLE EXCITON GENERATION SOLID-STATE PHOTOVOLTAIC RESPONSE ELECTRON INJECTION NANOCRYSTAL INKS ORGANIC-DYES CUINSE2 EFFICIENCY PERFORMANCE CYTOTOXICITY Copper-indium-selenide quantum dot-sensitized solar cells Article 10.1039/c3cp54270j 1 PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.15, no.47, pp.20517 - 20525 PHYSICAL CHEMISTRY CHEMICAL PHYSICS 15 47 20517 20525 scie scopus 000327249700013 2-s2.0-84887924699 Chemistry, Physical Physics, Atomic, Molecular & Chemical Chemistry Physics Article MULTIPLE EXCITON GENERATION SOLID-STATE PHOTOVOLTAIC RESPONSE ELECTRON INJECTION NANOCRYSTAL INKS ORGANIC-DYES CUINSE2 EFFICIENCY PERFORMANCE CYTOTOXICITY quantum dot Copper-indium-selenide sensitized solar cells