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Vertical plane depth-resolved surface potential and carrier separation characteristics in flexible CZTSSe solar cells with over 12% efficiency

Title
Vertical plane depth-resolved surface potential and carrier separation characteristics in flexible CZTSSe solar cells with over 12% efficiency
Author(s)
Son, Dae-HoPark, Ha KyungKim, Dae-HwanKang, Jin-KyuSung, Shi-JoonHwang, Dae-KueLee, JaebaekJeon, Dong-HwanCho, YunaeJo, WilliamLee, TaeseonKim, JunHoNam, Sang-HoonYang, Kee-Jeong
Issued Date
2024-03
Citation
Carbon Energy, v.6, no.3
Type
Article
Author Keywords
carrier separationCZTSSeflexible solar celllocal currentsurface potential
Keywords
CU2ZNSN(S,SE)(4) THIN-FILMSGRAIN-BOUNDARIESCU2ZNSNS4BAND-GAPDEFECTS
ISSN
2637-9368
Abstract
Cu2ZnSn(S,Se)4 (CZTSSe) solar cells have resource distribution and economic advantages. The main cause of their low efficiency is carrier loss resulting from recombination of photo-generated electron and hole. To overcome this, it is important to understand their electron-hole behavior characteristics. To determine the carrier separation characteristics, we measured the surface potential and the local current in terms of the absorber depth. The elemental variation in the intragrains (IGs) and at the grain boundaries (GBs) caused a band edge shift and bandgap (Eg) change. At the absorber surface and subsurface, an upward Ec and Ev band bending structure was observed at the GBs, and the carrier separation was improved. At the absorber center, both upward Ec and Ev and downward Ec-upward Ev band bending structures were observed at the GBs, and the carrier separation was degraded. To improve the carrier separation and suppress carrier recombination, an upward Ec and Ev band bending structure at the GBs is desirable. © 2024 The Authors. Carbon Energy published by Wenzhou University and John Wiley & Sons Australia, Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
URI
http://hdl.handle.net/20.500.11750/47600
DOI
10.1002/cey2.434
Publisher
Wiley
Related Researcher
Files in This Item:
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Appears in Collections:
Division of Energy Technology 1. Journal Articles
Division of Electronics & Information System 1. Journal Articles

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