Enhanced photoconduction of free-standing ZnO nanowire films by L-lysine treatment
Liu, Jinzhang, Park, Jaeku, Park, Kyung Ho, Ahn, Yeonghwan, Park, Ji-Yong, Koh, Ken Ha, & Lee, Soonil (2010) Enhanced photoconduction of free-standing ZnO nanowire films by L-lysine treatment. Nanotechnology, 21(48), 485504-1--485504-7.
Flexible paper-like ZnO nanowire films are fabricated and the effect of L-lysine passivation of the nanowire surfaces on improving the UV photoresponse is studied. We prepare three types of nanowires with different defect contents, and find that the L-lysine treatment can suppress the oxygen-vacancy-related photoluminescence as well as enhance the UV photoconduction. The nanowires with fewer defects gain larger enhancement of UV photoconduction after L-lysine treatment. Reproducible UV photoresponse of the devices in humid air is obtained due to L-lysine surface passivation, ruling out the influence of water molecules in degrading the UV photocurrent.
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