Efficient Sb2s3 and Low Se Content Sb2seys3-Y Indoor Photovoltaics

Sb2S3 is a promising absorber material for indoor photovoltaics due to the appropriate direct bandgap of 1.75 eV, high element abundance, low toxicity, stable and single phase. Considering the indoor lighting irradiance is very low and the resulting carrier numbers are relatively less and Sb2S3 is quasi-one-dimensional crystal structure, the preferential orientation controlling of Sb2S3 is very important to improve the power conversion efficiency (PCE) of Sb2S3 indoor photovoltaics. Herein, Sb2S3 and low Se content Sb2SeyS3-y films are prepared by chemical bath deposition and the preferential orientation of Sb2S3 films is controlled by introducing SbCl3 and selenourea in the growth solution. The uniformity of the S and Se distribution in low Se content Sb2SeyS3-y films is adjusted by introducing EDTA-2Na. Using the warm white LED with color temperature of 3347 K and illuminance of 1000 lux, Sb2S3 and low Se content Sb2SeyS3-y indoor photovoltaics achieve the PCE of 16.58% for Sb2S3 and 17.62% for Sb2SeyS3-y, which is the highest PCE for antimony chalcogenide indoor photovoltaics. Therefore, the preferential orientation controlling by introducing SbCl3 and selenourea into the growth solution is an efficient strategy for fabricating high-efficiency Sb2S3 and low Se content Sb2SeyS3-y indoor photovoltaics.