Ultraviolet photodetection characteristics of Zinc oxide thin films and nanostructures

5th National Conference on Processing and Characterization of Materials

Ghosh, S.P.^1 ; Das, K.C.^1 ; Tripathy, N.^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: As-deposited films;    Comparative studies;    Current voltage measurement;    Equi-molar solution;    Photo detection;    Transient photocurrents;    Ultraviolet;    Zinc oxide thin films;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/115/1/012035/pdf
DOI  :  10.1088/1757-899X/115/1/012035

来源: IOP

【 摘 要 】

ZnO thin films were deposited by using RF sputtering technique at 150W and 4×10-3mbar pressure. Post-deposition rapid thermal annealing of ZnO thin films were carried out at 1000°C for 600sec. ZnO nanostructures (nanowires/nanorods) were hydrothermally grown by using equimolar solution of Zinc nitrate and hexamethyltetramine. Morphology of ZnO thin films and nanostructures were investigated using scanning electron microscope. A comparative study on the ultraviolet photodetection behaviour of ZnO thin films and nanostructures were carried out by adopting current-voltage measurement technique at room temperature. ZnO annealed films have shown relatively lower transient photocurrent decay as compared to as- deposited film, which may be due to the faster evacuation of the charge carries. However, in case of ZnO nanorods transient photocurrent decay is relatively slow than that of nanowires, which is attributed to delayed readsorption of oxygen molecules onto the nanorods surface due to its larger width.