基于氯化物处理的钙钛矿自供电无电荷传输层光电探测器用于弱光检测
Self-powered and charge-transport-layer-free photodetectors based on chloride treated perovskites for weak light detection
梁海霞 1张钧尧 1高玉山 1郭璞 1李立 1郭子亿 1吴岳 1黄佳2
作者信息
- 1. School of Materials Science and Engineering,Tongji University,Shanghai 201804,China
- 2. School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;National Key Laboratory of Autonomous Intelligent Unmanned Systems,Tongji University,Shanghai 201804,China
- 折叠
摘要
有机-无机卤化物钙钛矿因其可溶液加工和优异的光电特性而在光电探测器(PD)中得到了广泛应用.然而,基于钙钛矿的PD一般需要电荷传输层提供足够的分离和传输驱动力,这会增加钙钛矿PD的材料成本.本研究通过溶液法制备了基于苯基三甲基氯化铵(PTAC1)处理的无电荷传输层钙钛矿自供电PD.以(CsFAMA)Pb(BrI)3作为光活性层,这种三元阳离子混合卤化物钙钛矿沉积后的垂直分布差异为电荷分离和传输提供了驱动力,PTAC1处理能加强电荷分离和运输.这种PD在自供电模式下表现出优异的光电探测性能,其中光暗电流比为1.8 × 105,响应度为 198 mA W-1,探测率为 1.48 × 1013/1.24 × 1011 Jones(暗/噪声电流法计算).没有封装的PD在700 h的测试中也表现出良好的空气稳定性,且该PD对0.64 nW cm-2的弱光仍有明显的响应,PD阵列也验证了这种弱光检测能力.本工作制备的钙钛矿自供电PD为弱光检测的发展提供了一种简单可行的途径.
Abstract
Organic-inorganic halide perovskite materials have been widely used in photodetectors(PDs)for the solution processability and outstanding optoelectronic characteristics.However,conventional perovskite-based PDs normally re-quire both electron transport materials and hole transport materials to provide sufficient driving forces for separating the hole-electron pairs while concurrently enhancing the processing consumption.In this study,the high-performance self-powered PDs without charge transport layers based on phenyltrimethylammonium chloride(PTACI)-treated per-ovskite are fabricated via a simple solution process.The triple-cation mixed halides perovskite(CsFAMA)Pb(BrI)3 acts the photo active layer for its uneven distribution vertically,which will provide the driving forces for charge separation and transportation.With the treatment of PTAC1,the charge se-paration and transportation are further accelerated,which has been proved by electrochemical impedance spectroscopy and Mott-Schottky measurements.Therefore,the PDs can still achieve outstanding photodetection performance,even under the self-powered operation mode,including the Ilight/Idark ratio up to 1.8 × 105,responsivity up to 198 mA W-1,and detectivity up to 1.48 × 1013/1.24 × 1011 Jones(calculated by dark/noise current methods).More significantly,the devices can exhibit an obvious response to weak light of 0.64 nW cm-2,and a PD array is also fabricated to verify the weak light detection capability.Furthermore,the PDs without any encapsulation exhibit excellent air stability during a 700-h test.Our reali-zation of self-powered perovskite-based PDs offers a simple and feasible pathway toward the development of weak light detection.
关键词
photodetectors/perovskites/weak light detection/charge transport layer freeKey words
photodetectors/perovskites/weak light detection/charge transport layer free引用本文复制引用
基金项目
National Natural Science Foundation of China(62074111)
National Natural Science Foundation of China(62374115)
Innovation Program of Shanghai Municipal Education Commission(2021-01-07-00-07-E00096)
National Key Research and Development Program of China(2022YFB3203502)
出版年
2024
NETL
NSTL
万方数据