Material processing is critical for obtaining high-performance solar cells, which influences the morphological, crystal, and electrical properties of the functional materials in a device. Sb 2 (S,Se) 3 can be considered as a quasi-binary compound since sulfur and selenium can be alloyed with a continuous ratio due to the identical crystal structure of Sb 2 S 3 and Sb 2 Se 3 and close ionic radius between sulfur and selenium. [1-3] This simple chemical composition allows for facile synthesis of Sb 2 (S,Se) 3 film with a well-defined crystal structure. In this regard, both

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