Electrochemical Doping of Halide Perovskites with Ion Intercalation

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• 作者：Qinglong Jiang ; Mingming Chen ; Junqiang Li ; Mingchao Wang ; Xiaoqiao Zeng ; Tiglet BesaraJun Lu ; Yan XinXin Shan ; Bicai Pan ; Changchun Wang ; Shangchao Lin ; Theo Siegrist ; Qiangfeng XiaoZhibin Yu
• 刊名：ACS Nano
• 出版年：2017
• 出版时间：January 24, 2017
• 年：2017
• 卷：11
• 期：1
• 页码：1073-1079
• 全文大小：434K
• ISSN：1936-086X

文摘

Halide perovskites have recently been investigated for various solution-processed optoelectronic devices. The majority of studies have focused on using intrinsic halide perovskites, and the intentional incoporation of dopants has not been well explored. In this work, we discovered that small alkali ions, including lithium and sodium ions, could be electrochemically intercalated into a variety of halide and pseudohalide perovskites. The ion intercalation caused a lattice expansion of the perovskite crystals and resulted in an n-type doping of the perovskites. Such electrochemical doping improved the conductivity and changed the color of the perovskites, leading to an electrochromism with more than 40% reduction of transmittance in the 450–850 nm wavelength range. The doped perovskites exhibited improved electron injection efficiency into the pristine perovskite crystals, resulting in bright light-emitting diodes with a low turn-on voltage.