Department of Chemical and Biological Engineering, Monash University, Clayton, Victoria 3800, Australia.
ARC Center of Excellence in Exciton Science, Monash University, Clayton, Victoria 3800, Australia.
ACS Appl Mater Interfaces. 2023 Apr 19;15(15):18800-18807. doi: 10.1021/acsami.2c22179. Epub 2023 Apr 9.
Wide-bandgap (WBG) perovskites have great potential for inclusion in efficient tandem solar cells, but large open-circuit voltage losses have limited device performance to date. Here, we show that a high-quality WBG perovskite, FACsPb(IBr), with enlarged grain sizes and improved crystallinity can be achieved by incorporating lead chloride (PbCl) into a lead acetate (PbAc)-based precursor. The improved film quality resulted in the suppression of nonradiative recombination and a reduction in defect density. Efficient WBG perovskite solar cells (1.66 eV) with an efficiency of 19.3% and a high of 1.22 V were fabricated using a facile one-step spin-coating method without the need for an antisolvent. Notably, the unencapsulated devices retained 90% of their initial power conversion efficiency after storage in a dry box (10% humidity) for 800 h.
宽能隙 (WBG) 钙钛矿在高效串联太阳能电池中有很大的应用潜力，但大的开路电压损耗限制了迄今为止的器件性能。在这里，我们表明，通过在基于醋酸铅 (PbAc) 的前体中加入氯化铅 (PbCl)，可以得到高质量的 WBG 钙钛矿 FACsPb(IBr)，其晶粒尺寸增大，结晶性提高。改善的薄膜质量抑制了非辐射复合并降低了缺陷密度。使用简便的一步旋涂法制备高效 WBG 钙钛矿太阳能电池 (1.66 eV)，效率为 19.3%，Voc 为 1.22 V，无需使用抗溶剂。值得注意的是，未封装的器件在干燥箱 (10%湿度) 中储存 800 小时后，其初始功率转换效率保留了 90%。
