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Activated Electron-Transport Layers for Infrared Quantum Dot Optoelectronics
- Activated Electron-Transport Layers for Infrared Quantum Dot Optoelectronics
- Choi, Jongmin; Jo, Jea Woong; de Arquer, F. Pelayo Garcia; Zhao, Yong-Biao; Sun, Bin; Kim, Junghwan; Choi, Min-Jae; Baek, Se-Woong; Proppe, Andrew H.; Seifitokaldani, Ali; Nam, Dae-Hyun; Li, Peicheng; Ouellette, Olivier; Kim, Younghoon; Voznyy, Oleksandr; Hoogland, Sjoerd; Kelley, Shana O.; Lu, Zheng-Hong; Sargent, Edward H.
- DGIST Authors
- Nam, Dae-Hyun; Kim, Younghoon
- Issue Date
- Advanced Materials, 30(29), 1801720
- Article Type
- Author Keywords
- conductivity; doping; Infrared; quantum dot solar cells; ZnO
- PEROVSKITE SOLAR-CELLS; DOPED ZNO FILMS; EFFICIENT; PHOTOVOLTAICS; SOLIDS; PHOTODETECTORS; PASSIVATION; TEMPERATURE
- Photovoltaic (PV) materials such as perovskites and silicon are generally unabsorptive at wavelengths longer than 1100 nm, leaving a significant portion of the IR solar spectrum unharvested. Small-bandgap colloidal quantum dots (CQDs) are a promising platform to offer tandem complementary IR PV solutions. Today, the best performing CQD PVs use zinc oxide (ZnO) as an electron-transport layer. However, these electrodes require ultraviolet (UV)-light activation to overcome the low carrier density of ZnO, precluding the realization of CQD tandem photovoltaics. Here, a new sol-gel UV-free electrode based on Al/Cl hybrid doping of ZnO (CAZO) is developed. Al heterovalent doping provides a strong n-type character while Cl surface passivation leads to a more favorable band alignment for electron extraction. CAZO CQD IR solar cell devices exhibit, at wavelengths beyond the Si bandgap, an external quantum efficiency of 73%, leading to an additional 0.92% IR power conversion efficiency without UV activation. Conventional ZnO devices, on the other hand, add fewer than 0.01 power points at these operating conditions. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- Wiley-VCH Verlag
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- Division of Energy Technology1. Journal Articles
Department of Energy Science and EngineeringRenewable Energy Conversion Materials Laboratory1. Journal Articles
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