ZnTe/ZnSe (Core/Shell) Type-II Quantum Dots: Their Optical and Photovoltaic Properties
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- ZnTe/ZnSe (Core/Shell) Type-II Quantum Dots: Their Optical and Photovoltaic Properties
- Bang, Jiwon; Park, Juwon; Lee, Ji Hwang; Won, Nayoun; Nam, Jutaek; Lim, Jongwoo; Chang, Byoung Yong; Lee, Hyo Joong; Chon, Bonghwan; Shin, Junghan; Park, Jae Byung; Choi, Jong Hwa; Cho, Kilwon; Park, Su-Moon; Joo, Taiha; Kim, Sungjee
- Band engineering; Carrier extraction; Core/shell; Environmentally-friendly; Material choice; Organic solar cell; Photovoltaic devices; Photovoltaic property; PL lifetime; Power conversion efficiencies; QD devices; Quantum Dot; Quantum dots; Wavelength regimes
- Issue Date
- AMER CHEMICAL SOC
- CHEMISTRY OF MATERIALS, v.22, no.1, pp.233 - 240
- Synthesis of a size series of colloidal ZnTe/ZnSe (core/shell) quantum dots (QDs) is reported. Because of the unique Type-II characters, their emission can range over an extended wavelength regime, showing photoluminescence (PL) from blue to amber. The PL lifetime measures as long as 77 ns, which clearly indicates the Type-II characteristics. ZnTe/ZnSe (Core/Shell) QDs can be further passivated by ZnS layers, rendered in water, while preserving the optical and chemical stabilities and thus proved their potentials toward "nontoxic" biological or medical applications that are free from concerns regarding heavy-metal leakage. ZnTe/ZnSe Type-II QD/polymer hybrid organic solar cells are also showcased, promising environmentally friendly photovoltaic devices. ZnTe/ZnSe Type-II QD incorporated photovoltaic devices show 11 times higher power conversion efficiency, when compared to that of the control ZnSe QD devices. This results from the Type-II characteristic broad QD absorption Lip to extended wavelengths and the spatially separated Type-II excitons, which call enhance the carrier extractions. We believe that ZnTe/ZnSe-based Type-II band engineering can open many new possibilities as exploiting the safe material choice.
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