The enhancement of ZnO nanowalls photoconductivity induced by CdS nanoparticle modification

Fang, F.; Zhao, D. X.; Li, B. H.; Zhang, Z. Z.; Zhang, J. Y.; Shen, D. Z.
December 2008
Applied Physics Letters;12/8/2008, Vol. 93 Issue 23, p233115
Academic Journal
10 nm sized hexagonal CdS nanoparticles were decorated on the surface of well-aligned ZnO nanowall through a facile hydrothermal approach. The effects of CdS-cap layer on the optical and photoelectrical properties of ZnO nanowalls have been studied. It was found the CdS acted not only as a passivation layer to suppress the detrimental surface states of ZnO nanowalls, which reduced the deep-level emissions, but also as an interfacial carrier transport layer to reduce the probability of carrier recombination. Due to this effect a significant enhancement in ultraviolet photoconductivity of ZnO nanowalls was observed by the surface modification with CdS nanoparticles.


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