Nature Materials ( IF 37.2 ) Pub Date : 2024-04-29 , DOI: 10.1038/s41563-024-01876-2 Xiaoxue Ren 1, 2 , Jifei Wang 1, 2 , Yun Lin 2 , Yingwei Wang 2 , Haipeng Xie 1 , Han Huang 1, 2 , Bin Yang 3 , Yanfa Yan 4 , Yongli Gao 5 , Jun He 1, 2 , Jinsong Huang 6 , Yongbo Yuan 1, 2
For halide perovskites that are susceptible to photolysis and ion migration, iodide-related defects, such as iodine (I2) and iodine vacancies, are inevitable. Even a small number of these defects can trigger self-accelerating chemical reactions, posing serious challenges to the durability of perovskite solar cells. Fortunately, before I2 can damage the perovskites under illumination, they generally diffuse over a long distance. Therefore, detrimental I2 can be captured by interfacial materials with strong iodide/polyiodide (Ix−) affinities, such as fullerenes and perfluorodecyl iodide. However, fullerenes in direct contact with perovskites fail to confine Ix− ions within the perovskite layer but cause detrimental iodine vacancies. Perfluorodecyl iodide, with its directional Ix− affinity through halogen bonding, can both capture and confine Ix−. Therefore, inverted perovskite solar cells with over 10 times improved ultraviolet irradiation and thermal-light stabilities (under 85 °C and 1 sun illumination), and 1,000 times improved reverse-bias stability (under ISOS-V ageing tests) have been developed.
中文翻译:
移动碘化物捕获用于高度光解和反向偏压稳定的钙钛矿太阳能电池
对于易于光解和离子迁移的卤化物钙钛矿来说,与碘化物相关的缺陷,如碘(I 2 )和碘空位是不可避免的。即使这些缺陷很少,也会引发自加速化学反应,对钙钛矿太阳能电池的耐用性构成严峻挑战。幸运的是,在 I 2在光照下损坏钙钛矿之前,它们通常会扩散很长的距离。因此,有害的I 2可以被具有强碘化物/聚碘化物(I x - )亲和力的界面材料捕获,例如富勒烯和全氟癸基碘。然而,与钙钛矿直接接触的富勒烯无法将 I x -离子限制在钙钛矿层内,而是导致有害的碘空位。全氟癸基碘通过卤素键具有定向 I x -亲和力,可以捕获和限制 I x - 。因此,我们开发出了紫外辐照和热光稳定性(在85°C和1个太阳光照下)提高10倍以上、反向偏压稳定性(在ISOS-V老化测试下)提高1000倍以上的倒置钙钛矿太阳能电池。