The Enhanced Photovoltaic Performance of Sb2S3 Solar Cells by Thermal Decomposition of Antimony Ethyl Xanthate with Thiourea Doping

The thermal decomposition method is regarded as a simple and effective way to prepare Sb2S3 films. Herein, Sb2S3 films are prepared by thermal decompositions of antimony ethyl xanthate (Sb(xt)(3)). During the thermal decompositions process, sulfur vacancy defects are easily formed because of high temperatures. To reduce the sulfur vacancy defects in the final Sb2S3 films, thiourea (TU) is introduced in the Sb(xt) precursor. By doping with TU, the crystallinity of the Sb2S3 films improves and dense Sb2S3 films are formed. With the decrease in sulfur defects, the carrier concentrations are greatly increased from 2.5 x 10(16) to 6.2 x 10(16) cm(-3). Compared with the no-doping Sb2S3 solar cells, the power conversion efficiency of Sb2S3 solar cells with doping 25% TU is improved from 2.85% to 3.70%.