钙钛矿(结构)
材料科学
X射线光电子能谱
光电子学
基质(水族馆)
工作职能
开尔文探针力显微镜
磁滞
介电谱
钝化
光伏
化学工程
光伏系统
纳米技术
电极
凝聚态物理
物理化学
化学
物理
地质学
工程类
海洋学
原子力显微镜
生物
电化学
生态学
图层(电子)
作者
Nakita K. Noel,Severin N. Habisreutinger,Bernard Wenger,Yen‐Hung Lin,Fengyu Zhang,Jay B. Patel,Antoine Kahn,Michael B. Johnston,Henry J. Snaith
标识
DOI:10.1002/aenm.201903231
摘要
Abstract Halide perovskites are currently one of the most heavily researched emerging photovoltaic materials. Despite achieving remarkable power conversion efficiencies, perovskite solar cells have not yet achieved their full potential, with the interfaces between the perovskite and the charge‐selective layers being where most recombination losses occur. In this study, a fluorinated ionic liquid (IL) is employed to modify the perovskite/SnO 2 interface. Using Kelvin probe and photoelectron spectroscopy measurements, it is shown that depositing the perovskite onto an IL‐treated substrate results in the crystallization of a perovskite film which has a more n‐type character, evidenced by a decrease of the work function and a shift of the Fermi level toward the conduction band. Photoluminescence spectroscopy and time‐resolved microwave conductivity are used to investigate the optoelectronic properties of the perovskite grown on neat and IL‐modified surfaces and it is found that the modified substrate yields a perovskite film which exhibits an order of magnitude lower trap density than the control. When incorporated into solar cells, this interface modification results in a reduction in the current–voltage hysteresis and an improvement in device performance, with the best performing devices achieving steady‐state PCEs exceeding 20%.
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