Synthesis of copper doped Zinc oxide nanowires with enhanced ultraviolet photoresponse behavior

National Conference on Processing and Characterization of Materials

Ghosh, S.P.^1 ; Das, K.C.^1 ; Tripathy, N.^1 ; Moharana, A.^1 ; Adhikari, A.^1 ; Bose, G.^2 ; Kim, D.H.^3 ; Lee, T.I.^4 ; Myoung, J.M.^3 ; Kar, J.P.^1

Department of Physics and Astronomy, National Institute of Technology, Rourkela

769008, India^1

FST, IFHE University, Hyderabad

501203, India^2

Department of Materials Science and Engineering, Yonsei University, Seoul

120749, Korea, Republic of^3

Department of Bio-Nanotechnology, Gachon University, Gyeonggi-do

461701, Korea, Republic of^4

关键词: Dark current ratio;    Dopant concentrations;    Doped;    Hydrothermal methods;    Morphological characterization;    Photo detection;    Ultraviolet;    UV photosensitivity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/178/1/012021/pdf
DOI  :  10.1088/1757-899X/178/1/012021

来源: IOP

【 摘 要 】

This work mainly focused on the synthesis of copper doped zinc oxide nanowires by hydrothermal method, their characterization and their ultraviolet (UV) light sensing response at room temperature. The structural and morphological characterization was carried out using X-ray diffraction and scanning electron microscopy. Enhanced ultraviolet (UV) photodetection property has been achieved for a dopant concentration of 2.5wt% and 5wt% showing UV photosensitivity values (photo-to-dark current ratio) of around 800 and 1800, respectively. This is an order of magnitude higher than the undoped ZnO nanowires. High photocurrent gain is attributed to the trapping of carriers under dark and detrapping them under UV illumination by Cu-related defects. Enhancement in photosensitivity indicates that Cu-doped ZnO nanowires are promising candidates for UV photodetection applications.