The preferential orientation controlling for efficient Sb2S3 and low Se content Sb2SeyS3-y indoor photovoltaics

Abstract

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