• 文献标题:   Nanoscale photocurrent distribution in ultra-thin films of zinc oxide nanoparticles and their hybrid with reduced graphene oxide
  • 文献类型:   Article
  • 作  者:   MADHURI KP, BRAMHAIAH K, JOHN NS
  • 作者关键词:   atomic force microscopy, photocurrent, graphene composite, metal oxide film, electrical propertie
  • 出版物名称:   MATERIALS RESEARCH EXPRESS
  • ISSN:   2053-1591
  • 通讯作者地址:   Ctr Nano Soft Matter Sci
  • 被引频次:   3
  • DOI:   10.1088/2053-1591/3/3/035004
  • 出版年:   2016

▎ 摘  要

The electrical properties of ultra-thin films of ZnO nanoparticles and their hybrid with reduced graphene oxide (rGO), prepared at a liquid/liquid interface, are investigated. The photocurrent distribution in ZnO and rGO-ZnO films at nanoscale under UV irradiation is explored using conducting atomic force microscopy (C-AFM) and compared with the bulk electrical measurements. At the rGO-ZnO interface, ohmic contact is achieved rather than the Schottky junction encountered in bare ZnO with a metal electrode. Enhancement of the photocurrent is observed in both cases and the photoresponse mapping by C-AFM reveals an inhomogeneous current distribution at the nanoscale that is associated with various ZnO nanostructures in the film. While a small population of the nanostructures contributes higher photocurrents in bare ZnO film, the majority of the photoresponsive ZnO nanostructures provide high photoresponse in rGO-ZnO. This nanoscale electrical study gives insights into the local current contribution from individual nanostructures toward bulk electrical properties and can aid in understanding photovoltaic device performances.