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High-Efficiency Sb 2 Se 3 Solar Cells Modified by Potassium Hydroxide.

Authors :: Guo H
Zhao C
Xing Y
Tian H
Yan D
Zhang S
Jia X
Qiu J
Yuan N
Ding J
Source :: The journal of physical chemistry letters [J Phys Chem Lett] 2021 Dec 30; Vol. 12 (51), pp. 12352-12359. Date of Electronic Publication: 2021 Dec 22.
Publication Year :: 2021
Abstract: Antimony selenide (Sb <subscript>2</subscript> Se <subscript>3</subscript> ) has attracted considerable attention for its simple composition, nontoxic nature, and abundance. However, the efficiency of Sb <subscript>2</subscript> Se <subscript>3</subscript> solar cells is limited by the low carrier concentration and high recombination rate at the interface between Sb <subscript>2</subscript> Se <subscript>3</subscript> and the Au layer. For this paper, the KOH solution used as the etchant was used to increase the efficiency of Sb <subscript>2</subscript> Se <subscript>3</subscript> solar cells. The KOH solution not only reacts with (etching the surface) but also diffuses inside the Sb <subscript>2</subscript> Se <subscript>3</subscript> film. This study unexpectedly demonstrates that KOH also increases the doping density and improves the back contact (the thin Sb <subscript>2</subscript> O <subscript>3</subscript> layer exists with the etching of the KOH solution) of Sb <subscript>2</subscript> Se <subscript>3</subscript> solar cells. Lastly, the best power conversion efficiency of 7.16% is demonstrated with a high open-circuit voltage of 0.407 V; we believe our work can serve as a guide for further development of high-efficiency Sb <subscript>2</subscript> Se <subscript>3</subscript> solar cells.