DMF‐Based Large‐Grain Spanning Cu2ZnSn(Sx,Se1‐x)4 Device with a PCE of 11.76%

Yubo Cui; Mengyang Wang; Peizhe Dong; Shuangshuang Zhang; Junjie Fu; Libo Fan; Chaoliang Zhao; Sixin Wu; Zhi Zheng

doi:10.1002/advs.202201241

Advanced Science (Jul 2022)

DMF‐Based Large‐Grain Spanning Cu2ZnSn(Sx,Se1‐x)4 Device with a PCE of 11.76%

Yubo Cui,
Mengyang Wang,
Peizhe Dong,
Shuangshuang Zhang,
Junjie Fu,
Libo Fan,
Chaoliang Zhao,
Sixin Wu,
Zhi Zheng

Affiliations

Yubo Cui: Key Laboratory of Micro‐Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Xuchang Henan Province 461000 P. R. China
Mengyang Wang: Key Laboratory of Micro‐Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Xuchang Henan Province 461000 P. R. China
Peizhe Dong: Key Laboratory of Micro‐Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Xuchang Henan Province 461000 P. R. China
Shuangshuang Zhang: Key Laboratory of Micro‐Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Xuchang Henan Province 461000 P. R. China
Junjie Fu: Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng Henan Province 475004 P. R. China
Libo Fan: Key Laboratory of Micro‐Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Xuchang Henan Province 461000 P. R. China
Chaoliang Zhao: Key Laboratory of Micro‐Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Xuchang Henan Province 461000 P. R. China
Sixin Wu: Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng Henan Province 475004 P. R. China
Zhi Zheng: Key Laboratory of Micro‐Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Xuchang Henan Province 461000 P. R. China

DOI: https://doi.org/10.1002/advs.202201241
Journal volume & issue: Vol. 9, no. 20
pp. n/a – n/a

Abstract

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Abstract A main concern of the promising DMF‐based Cu2ZnSn(Sx,Se1‐x)4 (CZTSSe) solar cells lies in the absence of a large‐grain spanning structure, which is a key factor for high open‐circuit voltage (Voc) and power conversion efficiency (PCE). A new strategy to achieve CZTSSe large‐grain spanning monolayer is proposed, by taking advantage of the synergistic optimization with a Cu2+ plus Sn2+ redox system and pre‐annealing temperatures. A series of structural, morphological, electrical, and photoelectric characterizations are employed to study the effects of the pre‐annealing temperatures on absorber qualities, and an optimized temperature of 430 ℃ is determined. The growth mechanism of the large‐grain spanning monolayer and the effect of redox reaction rate are carefully investigated. Three types of absorber growth mechanisms and a concept of critical temperature are proposed. The devices based on this large‐grain spanning monolayer suppress the recombination of carriers at crystal boundaries and interfaces. The champion device exhibits a high Voc (>500 mV) and PCE of 11.76%, which are both the maximum values among DMF‐based solar cells at the current stage.

Published in Advanced Science

ISSN: 2198-3844 (Online)
Publisher: Wiley
Country of publisher: Germany
LCC subjects: Science
Website: https://onlinelibrary.wiley.com/journal/21983844

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