光电探测器
材料科学
纳米片
制作
光电子学
钝化
量子点
量子效率
光致发光
光电流
带隙
成核
纳米技术
薄膜
钙钛矿(结构)
化学工程
图层(电子)
化学
有机化学
病理
工程类
替代医学
医学
作者
Shijie Liu,Hao Li,Haifei Lu,Yanran Wang,Xiaoyan Wen,Shuo Deng,Mingyu Li,Sisi Liu,Cong Wang,Xiao Li
出处
期刊:Nanomaterials
[Multidisciplinary Digital Publishing Institute]
日期:2022-11-27
卷期号:12 (23): 4217-4217
被引量:5
摘要
Two-dimensional (2D) organic−inorganic perovskites have great potential for the fabrication of next-generation photodetectors owing to their outstanding optoelectronic features, but their utilization has encountered a bottleneck in anisotropic carrier transportation induced by the unfavorable continuity of the thin films. We propose a facile approach for the fabrication of 0D ZnO quantum dot (QD)/2D (PEA)2PbI4 nanosheet hybrid photodetectors under the atmospheric conditions associated with the ZnO QD chloroform antisolvent. Profiting from the antisolvent, the uniform morphology of the perovskite thin films is obtained owing to the significantly accelerated nucleation site formation and grain growth rates, and ZnO QDs homogeneously decorate the surface of (PEA)2PbI4 nanosheets, which spontaneously passivate the defects on perovskites and enhance the carrier separation by the well-matched band structure. By varying the ZnO QD concentration, the Ion/Ioff ratio of the photodetectors radically elevates from 78.3 to 1040, and a 12-fold increase in the normalized detectivity is simultaneously observed. In addition, the agglomeration of perovskite grains is governed by the annealing temperature, and the photodetector fabricated at a relatively low temperature of 120 °C exhibits excellent stability after a 50-cycle test in the air condition without any encapsulation.
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