钙钛矿(结构)
材料科学
光伏
能量转换效率
蒸发
光致发光
碘化物
沉积(地质)
微观结构
薄膜
光伏系统
Crystal(编程语言)
化学工程
光电子学
纳米技术
无机化学
复合材料
化学
程序设计语言
物理
古生物学
工程类
沉积物
热力学
生物
计算机科学
生态学
作者
Zongbao Zhang,Ran Ji,Martin H. Kroll,Yvonne J. Hofstetter,Xiangkun Jia,David Becker‐Koch,Fabian Paulus,Markus Löffler,Frederik Nehm,Karl Leo,Yana Vaynzof
标识
DOI:10.1002/aenm.202100299
摘要
Abstract Thin‐film deposition by thermal evaporation offers many advantages, yet in the field of perovskite photovoltaics solution‐processed devices significantly outperform those fabricated by thermal evaporation. Here, high‐quality γ‐CsPbI 3 perovskite layers by coevaporation of PbI 2 and CsI with a small amount of phenylethylammonium iodide (PEAI) are deposited. It is demonstrated that the addition of PEAI into the perovskite layers leads to a preferred crystal orientation and a far improved microstructure, with columnar domains that protrude throughout the film's thickness. This is accompanied by a reduced density of defects as evidenced by the increase in photoluminescence and decrease in Urbach energy as compared to reference CsPbI 3 films. Photovoltaic devices based on the PEAI containing perovskite layers reach up to 15% in power conversion efficiency, thus surpassing not only the performance of reference CsPbI 3 devices, but also that of most solution‐processed PEAI containing inorganic CsPbX 3 (X = Cl, Br, I) perovskite solar cells. Importantly, encapsulated thermally evaporated perovskite devices maintain their performance for over 215 days, demonstrating the stabilizing effect of PEAI on thermally evaporated CsPbI 3 .
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