Co‐Evaporated CuSbSe₂ Thin Films for Solar Cells

CuSbSe 2 is a promising light‐harvesting material for solar cells, which shows advantages including low melting point, low cost, and environmental friendliness, as well as excellent optoelectronic properties. In this work, a three‐source co‐evaporation method is employed to deposit CuSbSe 2 thin films for the first time. Well‐crystallized and pure‐phase CuSbSe 2 films are obtained through a two‐stage co‐evaporation, and the reaction mechanism of CuSbSe 2 is revealed based on the phase evolution during film deposition process. It is also found that the growth atmosphere during the high‐temperature stage of co‐evaporation deposition exerts a significant impact on the phase, composition, crystallinity, and optoelectronic properties of CuSbSe 2 films. Eventually, a Mo/CuSbSe 2 /CdS/ZnO:Al (AZO)/Ag‐structured solar cell is successfully constructed, yielding a considerable power conversion efficiency of 1.83%.