Modulation and Direct Mapping of the Interfacial Band Alignment of an Eco-Friendly Zinc-Tin-Oxide Buffer Layer in SnS Solar Cells

In thin-film solar cells (TFSCs), the buffer layer plays a vital role in enhancing the power conversion efficiency (PCE) by improving the charge carrier dynamics. In the present study, a series of eco-friendly Zn1–x Sn x O y (ZTO, 0 ≤ x ≤ 1) films grown by atomic layer deposition are used as buffer...

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Published in:ACS applied energy materials 2022-11, Vol.5 (11), p.14531-14540
Main Authors: Ho, Thi-Thong, Yang, Zi-Liang, Fu, Fang-Yu, Jokar, Efat, Hsu, Hung-Chang, Liu, Pei-Chi, Quadir, Shaham, Chen, Cheng-Ying, Chiu, Ya-Ping, Wu, Chih-I, Chen, Kuei-Hsien, Chen, Li-Chyong
Format: Article
Language:English
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Summary:In thin-film solar cells (TFSCs), the buffer layer plays a vital role in enhancing the power conversion efficiency (PCE) by improving the charge carrier dynamics. In the present study, a series of eco-friendly Zn1–x Sn x O y (ZTO, 0 ≤ x ≤ 1) films grown by atomic layer deposition are used as buffer layers in the SnS-based TFSCs. We systematically investigate the effect of the Zn-to-Sn ratio on the band alignment at the SnS/ZTO heterojunction. The results revealed that by controlling the Zn-to-Sn ratio in the ZTO films, the energy band alignment changed from a “cliff-type” (9%Sn-ZTO41) to a “spike-type” (18%Sn-ZTO11). The spike-type band configuration with appropriate conduction band offset (CBO
ISSN:2574-0962
2574-0962
DOI:10.1021/acsaem.2c03129