title: Large enhancement of photocurrent gain based on the composite of a single n-type SnO2 nanowire and p-type NiO nanoparticles.
abstract: The high sensitivity of photodetector in the UV range based on the composite consisting of a single SnO(2) nanowire and NiO nanoparticles has been demonstrated. The underlying mechanism is attributed to the formation of p-NiO and n-SnO(2) heterojunction on the nanowire surface. The enhanced space charge region owing to the existence of p-n heterojunction increases the surface electric field, which will improve the separation of photogenerated electrons and holes, and the photoresponse gain will be greatly enhanced. This work shows a new approach that by decorating suitable p-type nanoparticles on n-type nanowires, the photoresponse gain can be enhanced drastically. Our result should be useful for creating novel high efficiency photodetectors.
authors.affiliation: Department of Physics, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Meng-Lin
authors.initials: ML
authors.lastname: Lu
authors.forename: Tzu-Yun
authors.initials: TY
authors.lastname: Lin
authors.forename: Tong-Min
authors.initials: TM
authors.lastname: Weng
authors.forename: Yang-Fang
authors.initials: YF
authors.lastname: Chen