钝化
材料科学
卤化物
钙钛矿(结构)
碘化物
能量转换效率
光电流
钙钛矿太阳能电池
化学工程
光致发光
碘化铵
甲脒
相对湿度
开尔文探针力显微镜
溴化铵
无机化学
光电子学
纳米技术
原子力显微镜
图层(电子)
工程类
化学
物理
热力学
肺表面活性物质
作者
Yongyoon Cho,Arman Mahboubi Soufiani,Jae Sung Yun,Jin-Cheol Kim,Da Seul Lee,Jan Seidel,Xinyang Deng,Martin A. Green,Shujuan Huang,Anita Ho‐Baillie
标识
DOI:10.1002/aenm.201703392
摘要
Abstract Layered low‐dimensional perovskite structures employing bulky organic ammonium cations have shown significant improvement on stability but poorer performance generally compared to their 3D counterparts. Here, a mixed passivation (MP) treatment is reported that uses a mixture of bulky organic ammonium iodide ( iso ‐butylammonium iodide, i BAI) and formammidinium iodide (FAI), enhancing both power conversion efficiency and stability. Through a combination of inactivation of the interfacial trap sites, characterized by photoluminescence measurement, and formation of an interfacial energetic barrier by which ionic transport is reduced, demonstrated by Kelvin probe force microscopy, MP treatment of the perovskite/hole transport layer interface significantly suppresses photocurrent hysteresis. Using this MP treatment, the champion mixed‐halide perovskite cell achieves a reverse scan and stabilized power conversion efficiency of 21.7%. Without encapsulation, the devices show excellent moisture stability, sustaining over 87% of the original performance after 38 d storage in ambient environment under 75 ± 20% relative humidity. This work shows that FAI/ i BAI, is a new and promising material combination for passivating perovskite/selective‐contact interfaces.
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