Chen Jiwen, Fan Xi, Wang Jinzhao, Wang Jing, Zeng Jixi, Zhang Ziqi, Li Jia, Song Weijie
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
School of Material Science and Engineering, Hubei University, Wuhan 430062, China.
ACS Nano. 2024 Jul 23;18(29):19190-19199. doi: 10.1021/acsnano.4c04768. Epub 2024 Jul 11.
Lewis base molecules bind the undercoordinated lead atoms at interfaces and grain boundaries, leading to the high efficiency and stability of flexible perovskite solar cells (PSCs). We demonstrated a highly efficient, stable, and flexible PSC via interface passivation using a Lewis base of tri(-tolyl)phosphine (TTP). It not only induced an intimate interface contact and a complete deposition of the perovskite thin layers on hole transport layers (HTLs) but also led to a better perovskite with a raised crystallinity, fewer defects, and a better morphology, including fewer gullies, high uniformity, and low roughness. Furthermore, the TTP treatments induced a good alignment of energy levels among the perovskites, HTLs, and C. The resultant flexible inverted PSCs exhibited a high power conversion efficiency (PCE) of 23.81%, which is one of the highest PCEs among these flexible inverted PSCs. Moreover, the optimized flexible PSCs exhibited high storage stability, superior operation stability, and enhanced mechanical flexibility. This study presents an effective method to substantially raise the PCE, stability, and mechanical flexibility of the flexible inverted perovskite photovoltaics.
路易斯碱分子在界面和晶界处与配位不足的铅原子结合，从而实现了柔性钙钛矿太阳能电池（PSC）的高效率和稳定性。我们通过使用三（对甲苯基）膦（TTP）这种路易斯碱进行界面钝化，展示了一种高效、稳定且柔性的PSC。它不仅促使界面紧密接触以及钙钛矿薄层在空穴传输层（HTL）上完全沉积，还生成了结晶度更高、缺陷更少且形态更好的钙钛矿，包括更少的沟壑、更高的均匀性和更低的粗糙度。此外，TTP处理使钙钛矿、HTL和C之间的能级实现了良好的对齐。由此得到的柔性倒置PSC展现出23.81%的高功率转换效率（PCE），这是这些柔性倒置PSC中最高的PCE之一。此外，优化后的柔性PSC表现出高存储稳定性、卓越的运行稳定性和增强的机械柔韧性。本研究提出了一种有效方法，可大幅提高柔性倒置钙钛矿光伏器件的PCE、稳定性和机械柔韧性。
