Sb2(Se1-xSx)3 Thin-Film Solar Cells Fabricated by Single-Source Vapor Transport Deposition

The properties of Sb-2(Se1-xSx)(3) alloy films can be continuously tuned by changing its composition, enabling potentially better device efficiency compared to the Sb2S3 or Sb2Se3 counterparts. Fabrication of Sb-2(Se1-xSx)(3) films with good uniformity and orientation are prerequisites to realize their full potential. Here, pure-phase and high-uniformity Sb-2(Se1-xSx)(3) absorbers are successfully produced via a vapor transport deposition method employing a single evaporation source. Increasing the travelling distance of vapor particles can improve the morphology and crystallinity of Sb-2(Se1-xSx)(3) films, and as a result, compact Sb-2(Se1-xSx)(3) films with strong preferential [221] orientation and uniform composition throughout the whole film are obtained. Further, the CdS surface is treated with H2O2 solution and a device with a champion efficiency of 6.30% is obtained, a new efficiency record for Sb-2(Se1-xSx)(3) based thin-film solar cells without a hole-transporting layer.