Journal
NATURE ENERGY
Volume 5, Issue 8, Pages 587-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41560-020-0652-3
Keywords
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Funding
- National Key Research and Development Program of China [2019YFA0405600]
- National Natural Science Foundation of China [61722402, 91833302, U1732150]
- Australian Renewable Energy Agency (ARENA)
- Australian Renewable Energy Agency [RND011]
- Shanghai Academic/Technology Research Leader [19XD1421300]
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Antimony chalcogenides are emerging photovoltaic materials, yet difficulties in fabricating high-quality films limit device performance. We show that hydrothermal synthesis affords good morphology and reduced defects in antimony selenosulfide films, enabling solar cells with an efficiency of 10%. Antimony selenosulfide, Sb-2(S,Se)(3), has attracted attention over the last few years as a light-harvesting material for photovoltaic technology owing to its phase stability, earth abundancy and low toxicity. However, the lack of a suitable material processing approach to obtain Sb-2(S,Se)(3)films with optimal optoelectronic properties and morphology severely hampers prospects for efficiency improvement. Here we demonstrate a hydrothermal approach to deposit high-quality Sb-2(S,Se)(3)films. By varying the Se/S ratio and the temperature of the post-deposition annealing, we improve the film morphology, increase the grain size and reduce the number of defects. In particular, we find that increasing the Se/S ratio leads to a favourable orientation of the (Sb4S(e)(6))(n)ribbons (S(e) represents S or Se). By optmizing the hydrothermal deposition parameters and subsequent annealing, we report a Sb-2(S,Se)(3)cell with a certified 10.0% efficiency. This result highlights the potential of Sb-2(S,Se)(3)as an emerging photovoltaic material.
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