Feng Zihao, Liu Xinxing, Tian Ting, Zhu Zewei, Jiang Ruixuan, Li Jing, Yuan Ye, Gong Junbo, Gao Guanbin, Tong Jinhui, Peng Yong, Bai Sai, Huang Fuzhi, Xiao Xudong, Müller-Buschbaum Peter, Cheng Yi-Bing, Bu Tongle
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China.
School of Physics and Technology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan, 430072, P. R. China.
Adv Mater. 2025 Feb;37(8):e2412692. doi: 10.1002/adma.202412692. Epub 2025 Jan 6.
Effective modifications for the buried interface between self-assembled monolayers (SAMs) and perovskites are vital for the development of efficient, stable inverted perovskite solar cells (PSCs) and their tandem photovoltaics. Herein, an ionic-liquid-SAM hybrid strategy is developed to synergistically optimize the uniformity of SAMs and the crystallization of perovskites above. Specifically, an ionic liquid of 1-butyl-3-methyl-1H-imidazol-3-iumbis((trifluoromethyl)sulfonyl)amide (BMIMTFSI) is incorporated into the SAM solution, enabling reduced surface roughness, improved wettability, and a more evenly distributed surface potential of the SAM film. Leveraging this optimized substrate, a favorable growth of high-quality perovskite crystals is achieved. Furthermore, the introduced functional ions readily bond with the perovskites, effectively passivating undesirable cation or halide vacancies of the perovskite near the buried interface. Remarkably, high power conversion efficiencies (PCEs) of 25.68% and 22.53% are obtained for normal-bandgap (≈1.55 eV) and wide-bandgap (WBG) (≈1.66 eV) PSCs along with improved operational stability. Additionally, a champion PCE of 19.50% is achieved for semitransparent WBG PSCs, further delivering an impressive PCE of 28.34% for integrated four-terminal tandem photovoltaics when combined with CuInGaSe solar cells.
自组装单分子层（SAMs）与钙钛矿之间的掩埋界面的有效改性对于高效、稳定的倒置钙钛矿太阳能电池（PSC）及其串联光伏器件的发展至关重要。在此，开发了一种离子液体-SAM混合策略，以协同优化SAMs的均匀性和上方钙钛矿的结晶。具体而言，将1-丁基-3-甲基-1H-咪唑-3-鎓双（（三氟甲基）磺酰基）酰胺（BMIMTFSI）离子液体掺入SAM溶液中，可降低表面粗糙度、改善润湿性，并使SAM膜的表面电位分布更均匀。利用这种优化的衬底，实现了高质量钙钛矿晶体的良好生长。此外，引入的功能离子易于与钙钛矿结合，有效钝化掩埋界面附近钙钛矿中不需要的阳离子或卤化物空位。值得注意的是，正常带隙（≈1.55 eV）和宽带隙（WBG）（≈1.66 eV）的PSC分别获得了25.68%和22.53%的高功率转换效率（PCE），同时提高了运行稳定性。此外，半透明WBG PSC的最佳PCE达到19.50%，与铜铟镓硒太阳能电池结合时，集成四端串联光伏器件的PCE进一步达到令人印象深刻的28.34%。
