A liquid medium annealing strategy for highly [041]/[141]-oriented planar antimony sulfide solar cells with 7.23% efficiency

Antimony sulfide (Sb2S3) is regarded as one of candidate materials for tandem top cells with silicon based solar cells due to its non-toxicity, appropriate bandgap, high absorption coefficient and good stability. However, restricted by the difficulty of carrier transportation caused by unfavorable o...

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Bibliographic Details
Published in:Nano energy 2023-02, Vol.106, p.108064, Article 108064
Main Authors: Yao, Li-Quan, Lin, Li-Mei, Huang, Zhi-Ping, Mao, Yu, Li, Hu, Lin, Wen-Wei, Chen, Shui-Yuan, Huang, Zhi-Gao, Li, Jian-Min, Chen, Gui-Lin
Format: Article
Language:English
Subjects:
[hk1] orientation
Carrier transportation
Liquid medium annealing
Sb2S3
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Summary:Antimony sulfide (Sb2S3) is regarded as one of candidate materials for tandem top cells with silicon based solar cells due to its non-toxicity, appropriate bandgap, high absorption coefficient and good stability. However, restricted by the difficulty of carrier transportation caused by unfavorable orientations of Sb2S3, the power conversion efficiency (PCE) is still relatively low. In this work, a new annealing method, called liquid medium annealing (LMA), is developed to versatilely regulate the orientation of Sb2S3 films by controlling the concentration of Se22--OAm. Compared with conventional vapor-assisted annealing, a highly [041]/[141] oriented Sb2S3 film with unique title angles can be skillfully prepared by LMA with top-down model, which facilitates the photo-induced carrier separation along (Sb4S6)n ribbon. Meanwhile, such a LMA tactic can effectively tailor the band alignment at back contact by raises the valence band maximum (VBM) of Sb2S3, and then reducing hole collection barrier. Finally, a high PCE of 7.23% is achieved and considered the first echelon in planar Sb2S3 solar cells. [Display omitted] •An impressive PCE of 7.23% is achieved by a novel liquid medium annealing (LMA) for planar Sb2S3 solar cells.•Orientations regulation of Sb2S3 films can be realized by controlling the concentration of Se22--OAm medium.•(041)/(140) orientations with unique title angles of (Sb4S6)n ribbon enhance carrier transport and reduce shunt path.•Recycling oleylamine for LMA can effectively reduce the process cost.
ISSN:2211-2855
DOI:10.1016/j.nanoen.2022.108064