Liu Yang, Liu Qiuju, Lu Yusong, Fu Jianfei, Wu Jifeng, Tian Qingyong, Fan Bin, Zhang Yan, Bai Hua, Wang Hai-Qiao
School of Materials Science and Engineering (MSE), NingboTech University, No. 1 South Qianhu Road, Ningbo, 315211, China.
Kunshan GCL Optoelectronic Material Co. Ltd., Kunshan, Jiangsu, 215300, China.
Angew Chem Int Ed Engl. 2024 Jun 21;63(26):e202402568. doi: 10.1002/anie.202402568. Epub 2024 May 24.
The inefficient conversion of lead iodide to perovskite has become one of the major challenges in further improving the performance of perovskite solar cells fabricated by the two-step method. Herein, the discontinuous lead iodide layer realized by introduction of a polyfluorinated organic diammonium salt, octafluoro-([1,1'-biphenyl]-4,4'-diyl)-dimethanaminium (OFPP) iodide which does not form low-dimensional perovskites, can enable the satisfactory conversion of lead iodide into perovskite, leading to meliorated crystallinity and enlarged grains in the OFPP modulated perovskite (OFPP-PVK) film. Combined with the effective defect passivation, the OFPP-PVK films show enhanced charge mobility and suppressed charge recombination. Accordingly, the OFPP-based perovskite solar cells exhibit a champion efficiency of 24.76 % with better device stability. Moreover, a superior efficiency of 21.04 % was achieved in a large-area perovskite module (100 cm). Our work provides a unique insight into the function of organic diammonium additive in boosting photovoltaic performance.
碘化铅向钙钛矿的低效转化已成为进一步提高两步法制备的钙钛矿太阳能电池性能的主要挑战之一。在此，通过引入不形成低维钙钛矿的多氟有机二铵盐八氟-([1,1'-联苯]-4,4'-二基)-二甲铵（OFPP）碘化物实现的不连续碘化铅层，能够使碘化铅令人满意地转化为钙钛矿，从而改善OFPP调制钙钛矿（OFPP-PVK）薄膜的结晶度并增大晶粒尺寸。结合有效的缺陷钝化，OFPP-PVK薄膜显示出增强的电荷迁移率和抑制的电荷复合。因此，基于OFPP的钙钛矿太阳能电池表现出24.76%的最高效率以及更好的器件稳定性。此外，在大面积（100 cm）钙钛矿组件中实现了21.04%的优异效率。我们的工作为有机二铵添加剂在提高光伏性能方面的作用提供了独特的见解。
