材料科学
卤化物
钙钛矿(结构)
八面体
磁滞
金属
光伏系统
结晶学
纳米技术
光电子学
无机化学
晶体结构
凝聚态物理
物理
电气工程
化学
工程类
冶金
作者
Yang Jiang,Honglin Du,Rui Zhi,Mathias Uller Rothmann,Yulong Wang,Chao Wang,Guijie Liang,Zhi‐Yi Hu,Yi‐Bing Cheng,Wei Li
标识
DOI:10.1002/adma.202312157
摘要
Abstract The metal halide [BX 6 ] 4‐ octahedron, where B represents a metal cation and X represents a halide anion, is regarded as the fundamental structural and functional unit of metal halide perovskites. However, the influence of the way the [BX 6 ] 4− octahedra connect to each other has on the structural stability and optoelectronic properties of metal halide perovskite is still unclear. Here, we tune and reliably characterize the octahedral connectivity, including corner‐, edge‐, and face‐sharing, of various Cs x FA 1‐x PbI 3 (0≤ x ≤0.3) perovskite films through compositional and additive engineering, and with ultralow‐dose transmission electron microscopy. We find that the overall solar cell device performance, the charge carrier lifetime, the open‐circuit voltage, and the current density‐voltage hysteresis are all improved when the films consist of corner‐sharing octahedra, and non‐corner sharing phases are suppressed, even in films with the same chemical composition. Additionally, we find that the structural, optoelectronic, and device performance stabilities are similarly enhanced when non‐corner‐sharing connectivities are suppressed. Our approach, combining macroscopic device tests and microscopic material characterization, provides a powerful tool enabling a thorough understanding of the impact of octahedral connectivity on device performance, and opens a new parameter space for designing high‐performance photovoltaic metal halide perovskite devices. This article is protected by copyright. All rights reserved
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