Zhou Houpu, Chen Mengwei, Liu Chenguang, Zhang Rui, Li Jing, Liao Sainan, Lu Haifei, Yang Yingping
Department of Physics, School of Science, Wuhan University of Technology, Wuhan, China.
Hubei Engineering Research Center of RF-Microwave Technology and Application, Wuhan University of Technology, Wuhan, 430070, China.
Discov Nano. 2023 Feb 13;18(1):11. doi: 10.1186/s11671-023-03793-w.
Photodetectors (PDs) suffer from dark current due to defects in the perovskite photosensitive layer. Contact between the photosensitive layer and carbon electrodes could result in recombination of carriers at the interface. In this work, CsPbI quantum dots (QDs) were added between the photosensitive layer and the carbon electrode as the interfacial layer to passivate the surface defects of perovskite layer and improve the energy level matching at the interface. The effect of QDs concentrations on the passivation of the perovskite layer was investigated. It was found that the photoluminescence intensity of perovskite films was the strongest and the decay lifetime was the longest when the QDs concentration was 3 mg/mL. Owing to QDs passivation, the dark current of perovskite PD decreased by 94% from [Formula: see text] to [Formula: see text] A. The responsivity (R) at 605 nm improved by 27% from 0.29 to 0.37 A/W at 0 V bias voltage. The specific detectivity (D*) increased by 420% from [Formula: see text] to [Formula: see text] Jones.
由于钙钛矿光敏层中的缺陷，光电探测器（PD）存在暗电流。光敏层与碳电极之间的接触可能导致界面处载流子的复合。在这项工作中，在光敏层和碳电极之间添加了CsPbI量子点（QD）作为界面层，以钝化钙钛矿层的表面缺陷并改善界面处的能级匹配。研究了量子点浓度对钙钛矿层钝化的影响。结果发现，当量子点浓度为3mg/mL时，钙钛矿薄膜的光致发光强度最强，衰减寿命最长。由于量子点的钝化作用，钙钛矿光电探测器的暗电流从[公式：见原文]降至[公式：见原文]A，降低了94%。在0V偏置电压下，605nm处的响应度（R）从0.29A/W提高到0.37A/W，提高了27%。比探测率（D*）从[公式：见原文]提高到[公式：见原文]Jones，提高了420%。
