Lead accetate is an important lead source for preparation of organolead trihalide perovskites. In this work, we improved the performance of lead accetate based perovskite solar cells (PSCs) using a mix-solvent of γ-butyrolactone/dimethyl-sulfoxide (GBL/DMSO). Compared with the use of N,N-dimethylformamide (DMF)/DMSO, using GBL/DMSO efficiently retarded the crystallization of perovskite, which improved the crystallinity of the perovskite films. Consequently, the perovskite films processed from GBL/DMSO showed higher light harvesting, longer carrier lifetime and suppressed charge recombination properties in the PSCs. Power conversion efficiency (PCE) of the PSCs was significantly improved from 16.6 to 17.7% with simultaneous improvement in open-circuit voltage, short-circuit current density and fill factor. The best PSC showed a champion PCE of 18.1%, with a stable power output and negligible hysteresis. Moreover, the flexible PSCs (based on polyethylene naphthalate substrates) with perovskite processed from GBL/DMSO exhibited a high PCE of 13.2%. Our results indicate that using GBL/DMSO as a mix-solvent is a simple and effective way for performance improvement of lead-acetate-based PSCs.

乙酸铅是制备有机三卤化物钙钛矿的重要铅源。在这项工作中，我们使用γ-丁内酯/二甲基亚砜（GBL / DMSO）的混合溶剂改善了基于乙酸铅的钙钛矿型太阳能电池（PSC）的性能。与使用N，N相比使用GBL / DMSO的-二甲基甲酰胺（DMF）/ DMSO有效地阻止了钙钛矿的结晶，从而改善了钙钛矿薄膜的结晶度。因此，由GBL / DMSO处理的钙钛矿薄膜在PSC中显示出更高的光收集率，更长的载流子寿命和抑制的电荷复合特性。PSC的功率转换效率（PCE）从16.6显着提高到17.7％，同时开路电压，短路电流密度和填充因子也得到了改善。最佳的PSC表现出18.1％的最佳PCE，具有稳定的功率输出和可忽略的磁滞。此外，由GBL / DMSO处理的具有钙钛矿的柔性PSC（基于聚萘二甲酸乙二醇酯基质）显示出13.2％的高PCE。