Cs-treatments in Kesterite Thin-Film Solar Cells for Efficient Perovskite Tandems

Authors
Hwang, Sun KyungPark, So JeongPark, Jae HyunYoon, Joo HoYu Cho, JaeCho, Deok KiHeo, JaeyeongKim, Gee YeongKim, Jin Young
Issue Date
2024-04
Publisher
Wiley - V C H Verlag GmbbH & Co.
Citation
Small, v.20, no.16
Abstract
Cu2ZnSn(S,Se)(4) (CZTSSe) thin film solar cells are an attractive choice for a bottom cell of the low-cost and environmental tandem solar cells with perovskite. However, the progress in developing efficient perovskite/CZTSSe tandem solar cells has been hindered by the lack of high performance of the CZTSSe bottom cell. Here, an efficient CZTSSe bottom cell is demonstrated by adopting a facile and effective CsF treatment process. It is found that the CsF treatment not only facilitates grain growth and improves phase homogeneity by suppressing the detrimental deep-level defects and secondary phases, but also induces larger band bending and stronger drift force at the P-N junction. As a result, the carrier extraction/transport can be effectively accelerated, while reducing the interfacial recombination. These combined effects eventually result in a significant performance enhancement from 8.38% to 10.20%. The CsF-treated CZTSSe solar cell is finally applied to the mechanically-stacked perovskite/CZTSSe 4-terminal tandem cell by coupling a semi-transparent perovskite top cell, which exhibits the highest reported tandem efficiency of 23.01%.
Keywords
RB; PASSIVATION; NA; LI; 4-terminal tandem; CsF treatments; Cu2ZnSn(S,Se)(4) solar cells; electrodeposition; perovskites
ISSN
1613-6810
URI
https://pubs.kist.re.kr/handle/201004/113100
DOI
10.1002/smll.202307175
Appears in Collections:
KIST Article > 2023
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