钝化
钙钛矿(结构)
材料科学
光致发光
发光二极管
纳米晶
X射线光电子能谱
兴奋剂
量子产额
阳极
光电子学
量子效率
量子点
图层(电子)
纳米技术
化学工程
电极
化学
光学
结晶学
物理化学
工程类
物理
荧光
作者
Min Lu,Xiaoyu Zhang,Xue Bai,Hua Wu,Xinyu Shen,Yu Zhang,Wei Zhang,Weitao Zheng,Hongwei Song,William W. Yu,Andrey L. Rogach
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2018-06-13
卷期号:3 (7): 1571-1577
被引量:185
标识
DOI:10.1021/acsenergylett.8b00835
摘要
Lead halide perovskite nanocrystals are currently under intense investigation as components of solution-processed light-emitting devices (LEDs). We demonstrate LEDs based on Ag doped-passivated CsPbI3 perovskite nanocrystals with external quantum efficiency of 11.2% and an improved stability. Ag and trilayer MoO3/Au/MoO3 structure were used as cathode and anode, respectively, which reduce the electron injection barrier and ensure the high transparency and low resistance of the anode. Silver ions diffuse into perovskite film from the Ag electrode, as confirmed by the elemental mapping, the presence of Ag 3d peaks in the X-ray photoelectron spectrum, and the peak shift in the X-ray diffraction patterns of CsPbI3. In addition to doping, silver ions play the beneficial role of passivating surface defect states of CsPbI3 nanocrystals, which results in increased photoluminescence quantum yield, elongated emission lifetime, and improved stability of perovskite films.
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