Wang Tianyue, Yan Feng
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Chem Asian J. 2020 May 15;15(10):1524-1535. doi: 10.1002/asia.202000160. Epub 2020 Apr 16.
Organic-inorganic hybrid perovskite solar cells (PSCs) have aroused tremendous research interest for their high efficiency, low cost and solution processability. However, the involvement of toxic lead in state-of-art perovskites hinders their market prospects. As an alternative, Sn-based perovskites exhibit similar semiconductor characteristics and can potentially achieve comparable photovoltaic performance in comparison with their lead-based counterparts. The main challenge of developing Sn-based PCSs lies in the intrinsic poor stability of Sn , which could be oxidized and converted to Sn . Notably, introduction of SnX (X=Cl, Br, I) additive becomes indispensable in the fabrication process, which highlights the importance of incorporating a reducing agent to improve the device stability. Additionally, efforts are made to utilize other reducing agents with different functions for the further enhancement of device performance. Currently, Sn-based PSCs could attain a record efficiency over 10% with great stability. In this review, we present the recent progress on reducing agents for improving the stability of Sn-based PSCs, and we hope to shed light on the challenges and opportunities of this research field.
有机-无机杂化钙钛矿太阳能电池（PSC）因其高效率、低成本和可溶液加工性而引起了巨大的研究兴趣。然而，目前最先进的钙钛矿中含有有毒的铅，这阻碍了它们的市场前景。作为替代方案，锡基钙钛矿表现出相似的半导体特性，并且与铅基钙钛矿相比，有可能实现相当的光伏性能。开发锡基PSC的主要挑战在于锡本身稳定性较差，它可能被氧化并转化为Sn 。值得注意的是，在制造过程中引入SnX（X = Cl、Br、I）添加剂变得不可或缺，这凸显了加入还原剂以提高器件稳定性的重要性。此外，人们还努力使用具有不同功能的其他还原剂来进一步提高器件性能。目前，锡基PSC可以在具有高稳定性的情况下达到超过10%的创纪录效率。在这篇综述中，我们展示了用于提高锡基PSC稳定性的还原剂的最新进展，并且希望阐明该研究领域的挑战和机遇。
