Open AccessEnhancing ultraviolet photoresponse of ZnO nanowire device by surface functionalization
Author(s) -
Huang Jinhua,
Kun Zhang,
Nan Pan,
Zhiwei Gao,
Xiaoping Wang
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.7855
Subject(s) - surface modification , materials science , ultraviolet , photodetector , nanowire , optoelectronics , coating , conductance , polystyrene , irradiation , nanotechnology , chemical engineering , polymer , composite material , physics , condensed matter physics , engineering , nuclear physics
Single ZnO nanowire ultraviolet (UV) photodetector has been fabricated and the enhancement of its UV photoresponse by polystyrene sulfate surface functionalization has been investigated. It is found that under the same UV light irradiation UV photoresponse of the detector with surface functionalization increases by three orders of magnitude as compared to that without surface coating. By comparing I-V characteristics of the detectors we find that the dark conductance of the device can decrease by three orders of magnitude after surface coating while the light conductance shows little variation. The result demonstrates that one can readily enhance the UV photoresponse of the photodetector by surface functionalization.