Copper-indium-selenide quantum dot-sensitized solar cells
- Copper-indium-selenide quantum dot-sensitized solar cells
- 양지웅; 김재엽; 유정호; 안태영; 이현재; 최태석; 김영운; 주진; 고민재; 현택환
- quantum dot; Copper-indium-selenide; sensitized solar cells
- Issue Date
- Physical chemistry chemical physics : PCCP
- VOL 15, NO 47, 20517-20525
- 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 ~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.
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