A facile Ion-Exchange assisted chemical bath deposition of CuSbS2 for thin film solar cells
Copper antimony sulfur (CuSbS 2 ) possesses a band gap of about 1.5 eV, high absorption coefficient of > 10 4 cm −1 and abundant compositions, which is considered as one of the potential photovoltaic absorbers. In this work, we propose a facile ion-exchange assisted chemical bath deposition (IEACBD) method, which uses Cu + to replace Sb 3+ from the matrix of Sb 2 S 3 and then combine into CuSbS 2 alloy. Through systematic study, we found that this ion-exchange is a simultaneous interdiffusion process of Cu + and Sb 3+ ions, which enables a uniform mixture of those two elements. But it also inevitably produces a Sb 2 O 3 by-product on the surface of the film because of the alkaline environment of this chemical bath. To further remove it, we introduce a mild etching process with BDCA solution for Sb 2 O 3 and then obtain a high-quality CuSbS 2 . Finally, we assemble an inorganic CuSbS 2 solar cell with the architecture of FTO/TiO 2 /CdS/CuSbS 2 /Carbon/Ag, and delivering a photoelectric conversion efficiency of 0.75 %. This enriches the preparation method of CuSbS 2 thin film and also provides guidance for the synthesis of the similar multiple chalcogen compounds.
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