Modulation of anisotropic photoluminescence and photocurrent in PEA_(2)PbI_(4) single-crystal thin films  

作　　者：Tao Man Zicheng Li Xinyu Duan Zehui Zhou Junjie Cui Xiangxiang Chen Beibei Xu Jianrong Qiu 满涛;李子成;段心玉;周泽慧;崔俊杰;陈香香;许贝贝;邱建荣(Institute of Micro&Nano Photonics,State Key Laboratory of Extreme Photonics and Instrumentation,College of Optical Science and Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]Institute of Micro&Nano Photonics,State Key Laboratory of Extreme Photonics and Instrumentation,College of Optical Science and Engineering,Zhejiang University,Hangzhou 310058,China

出　　处：《Chinese Optics Letters》2024年第12期90-94,共5页中国光学快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.62375243);the Natural Science Foundation of Zhejiang Province(Nos.LD22E010001 and LR23E030002)。

摘　　要：The fundamental understanding of exciton physics and the anisotropic behavior of excitons and charge carriers in perovskite materials are pivotal to controlling the orientation of emission dipoles and the polarization of photocurrents to enhance the efficiency of light-emitting diodes(LEDs)and polarization photodetectors.However,it is not easy to clarify these fundamental physics and optoelectronic properties in traditional inorganic 3D perovskite polycrystalline thin films.Here,we found three narrow emission peaks with one broad peak from neutral excitons at 78 K in hybrid perovskite PEA_(2)PbI_(4)single crystals.The out-of-plane electric field can induce the dissociation of the excitons with a larger decrease in the emission intensity of the exciton with a higher out-of-plane component.Moreover,the photocurrent can be greatly increased up to a maximum of 11 times with the tuning of excitation polarization from 90°to 0°.These results deepen our understanding of the anisotropic exciton and charge carrier physics of perovskite materials to promote the development of highly efficient LEDs and polarization photodetectors.

关 键 词：PEA_2PbI_4single crystal anisotropic luminescence PHOTOCURRENT electric field 

分 类 号：TN3[电子电信—物理电子学]