Enhanced photoconduction of free-standing ZnO nanowire films by L-lysine treatment.
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.
Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea.
Jinzhang
J
Liu
Jaeku
J
Park
Kyung Ho
KH
Park
Yeonghwan
Y
Ahn
Ji-Yong
JY
Park
Ken Ha
KH
Koh
Soonil
S
Lee
D008027:Light; D008239:Lysine / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry* / Q000648:ultrastructure; D011208:Powders; D013057:Spectrum Analysis; D013696:Temperature; D013997:Time Factors; D015034:Zinc Oxide / Q000737:chemistry*
D011208:Powders; D008239:Lysine; D015034:Zinc Oxide