This work demonstrates a facile synthesis of highly crystalline, pinhole-free Cs3Sb2Br9 thin films via post-annealing in a solvent-rich atmosphere. The films remain stable for 3 days under 60% relative humidity. Solar cells produced from the solvent annealed Cs3Sb2Br9 films exhibit a power conversion efficiency of 0.173% ± 0.014%, improving over the 0.053% ± 0.006% from conventional methods.
Inorganic antimony halides with the general formula A3Sb2X9 have emerged as promising materials for photovoltaic applications due to their low toxicity and high stability. However, achieving high-quality thin-film morphology with this class of materials remains challenging, which adversely affects performance of the solar cell devices. In this work, a facile synthesis procedure is demonstrated for the fabrication of highly crystalline and pinhole-free Cs3Sb2Br9 thin films by introducing a post-annealing process in a solvent-rich atmosphere. Stability of the resulting Cs3Sb2Br9 films on a timescale of 3 days under ambient conditions at 60% relative humidity is demonstrated. Photovoltaic performance of the Cs3Sb2Br9 films is assessed using a standard n-i-p configuration, which produces a power conversion efficiency of 0.173% ± 0.014% under simulated 1 sun irradiation, which represents an improvement compared to the lower efficiency (0.053% ± 0.006%) observed in Cs3Sb2Br9 films prepared using conventional methods.
Solar RRL, Volume 9, Issue 8, April 2025. Read More
