He Xiaolong, Arain Zulqarnain, Liu Cheng, Yang Yi, Chen Jianlin, Zhang Xianfu, Huang Jingsong, Ding Yong, Liu Xuepeng, Dai Songyuan
Beijing Key Laboratory of Novel Thin-Film Solar Cells, School of New Energy, North China Electric Power University, Beijing 102206, P. R. China.
Oxford Suzhou Centre for Advanced Research, University of Oxford, Suzhou 215123, China.
Nanoscale. 2024 Sep 19;16(36):17042-17048. doi: 10.1039/d4nr02391a.
The top surface of the perovskite layer and the interface with the electron transporting layer play a key role in influencing the performance and operational stability of inverted perovskite solar cells (PSCs). A deficient or ineffective surface passivation strategy at the perovskite/electron transport layer interface can significantly impact the efficiency and scalability of PSCs. This study introduces phenyl dimethylammonium iodide (PDMAI) as a passivation ligand that exhibits improved chemical and field-effect passivation at the perovskite/C interface. It was found that PDMAI not only passivates surface defects and suppresses recombination through robust coordination but also repels minority carriers and reduces contact-induced interface recombination. The approach leads to a twofold reduction in defect densities and photoluminescence quantum yield loss. This approach enabled high power conversion efficiencies (PCEs) of 25.3% for small-area (0.1 cm) and 23.8% for large-area (1 cm) inverted PSCs. Additionally, PDMAI passivation enabled PSCs to demonstrate steady operation at 65 °C for >1200 hours in an ambient environment.
钙钛矿层的顶面以及与电子传输层的界面在影响倒置钙钛矿太阳能电池（PSC）的性能和运行稳定性方面起着关键作用。钙钛矿/电子传输层界面处缺乏或无效的表面钝化策略会显著影响PSC的效率和可扩展性。本研究引入苯基二甲基碘化铵（PDMAI）作为一种钝化配体，它在钙钛矿/C界面表现出改善的化学和场效应钝化。研究发现，PDMAI不仅通过强大的配位作用钝化表面缺陷并抑制复合，还排斥少数载流子并减少接触诱导的界面复合。该方法使缺陷密度和光致发光量子产率损失降低了两倍。这种方法使小面积（0.1平方厘米）倒置PSC的功率转换效率（PCE）达到25.3%，大面积（1平方厘米）倒置PSC的功率转换效率达到23.8%。此外，PDMAI钝化使PSC能够在环境温度为65°C的条件下在环境中稳定运行超过1200小时。
