Process Optimization and Light Soaking to Enhance Photovoltaic Performance of Antimony Sulfide Solar Cells
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Abstract
Antimony sulfide (Sb2S3) is an emerging wide bandgap semiconductor material with outstanding optoelectronic properties and potential applications for cost-effective and low-toxicity solar cells. Here, we report on the fabrication of Sb2S3 thin-film solar cells via a hydrothermal approach followed by postannealing and light soaking treatments. We investigate the process optimization of hydrothermal deposition, postannealing, and light soaking conditions. The results show that the hydrothermal growth at 135 °C for 225 min, combined with 350 °C postannealing for 10 min, leads to a champion power conversion efficiency (PCE) of 6.89%. Furthermore, light soaking of completed devices under one-sun irradiance at 70 °C for 120 min enhances the PCE to 7.69%. The device analysis implies that the performance improvement is mainly attributed to the enhanced charge transport properties in the hole transport layer. Our findings demonstrate a facile procedure to improve the photovoltaic performance of Sb2S3 solar cells.
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