Synthesis and photovoltaic effect of vertically aligned ZnO/ZnS core/shell nanowire arrays

摘要

A vertically aligned ZnO/ZnS core/shell nanowire array with type II band alignment was directlynsynthesized on an indium-tin-oxide glass substrate and the photovoltaic effect of the nanowirenarray was investigated. The epitaxial relationship, wurtzite u00010001u0002 matching zinc-blende u0001111u0002,nwas observed in the ZnO/ZnS nano-heterostructure. ZnS coating is found to quench thenphotoluminescence of ZnO nanowires but enhance the photocurrent with faster response in thenphotovoltaic device, indicating improvement in charge separation and collection in the type IIncore/shell nanowire. © 2010 American Institute of Physics. u0003doi:10.1063/1.3367706