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Activated Electron-Transport Layers for Infrared Quantum Dot Optoelectronics

Title
Activated Electron-Transport Layers for Infrared Quantum Dot Optoelectronics
Authors
Choi, JongminJo, Jea Woongde Arquer, F. Pelayo GarciaZhao, Yong-BiaoSun, BinKim, JunghwanChoi, Min-JaeBaek, Se-WoongProppe, Andrew H.Seifitokaldani, AliNam, Dae-HyunLi, PeichengOuellette, OlivierKim, YounghoonVoznyy, OleksandrHoogland, SjoerdKelley, Shana O.Lu, Zheng-HongSargent, Edward H.
DGIST Authors
Nam, Dae-HyunKim, Younghoon
Issue Date
2018-07
Citation
Advanced Materials, 30(29), 1801720
Type
Article
Article Type
Article
Author Keywords
conductivitydopingInfraredquantum dot solar cellsZnO
Keywords
PEROVSKITE SOLAR-CELLSDOPED ZNO FILMSEFFICIENTPHOTOVOLTAICSSOLIDSPHOTODETECTORSPASSIVATIONTEMPERATURE
ISSN
0935-9648
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/9321
DOI
10.1002/adma.201801720
Publisher
Wiley-VCH Verlag
Related Researcher
Files:
There are no files associated with this item.
Collection:
Division of Energy Technology1. Journal Articles
Department of Energy Science and EngineeringRenewable Energy Conversion Materials Laboratory1. Journal Articles


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