钙钛矿(结构)
电致发光
材料科学
离子
薄膜
光电子学
离子交换
溴化物
纳米技术
无机化学
化学工程
化学
结晶学
工程类
有机化学
图层(电子)
作者
Ting Zhao,Hongbin Liu,Mark E. Ziffer,Adharsh Rajagopal,Lijian Zuo,David S. Ginger,Xiaosong Li,Alex K.‐Y. Jen
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2018-06-19
卷期号:3 (7): 1662-1669
被引量:41
标识
DOI:10.1021/acsenergylett.8b00923
摘要
Organic–inorganic hybrid perovskites are promising materials for optoelectronic applications. Solution-processed films typically possess deleterious randomly oriented grains that limit their potential. Here, we report growth of highly oriented methylammonium lead bromide (MAPbBr3) films through ion exchange from 2D to 3D perovskite. We first investigate the ion exchange reaction mechanism for conversion between 2D and 3D perovskites using a combined experimental and theoretical approach. The selectivity of conversion is governed by thermodynamics and kinetics of the ion exchange reaction and is intimately linked to the molecular structure of the organic cation in 2D perovskite. Subsequently using the derived insights, we chose phenylethylammonium lead bromide (PEA2PbBr4) as the 2D growth template and successfully exchanged it into high-quality 3D MAPbBr3 films with strong uniaxial 100 orientation. The enhanced film quality leads to ultranarrow electroluminescence spectra (15.3 nm fwhm and 98.10% color purity) and demonstrates the immense potential of the ion exchange method for achieving ultra-high-resolution displays.
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