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Title: Enhanced emission and photoconductivity due to photo-induced charge transfer from Au nanoislands to ZnO

We report systematic studies based on photoluminescence, Hall, and photoconductivity measurements together with theoretical modeling in order to identify mechanisms for the photo-induced charge transfer effects in ZnO thin film incorporated with the Au nano-islands (AuNIs). Significant enhancement of near band edge emission and improvement in conductivity of ZnO/AuNIs samples after illumination are observed, which are attributed to the photo-induced hot electrons in Au which are then transferred into the conduction band of ZnO as long as the excitation energy is higher than the offset between the ZnO conduction-band minimum and Au Fermi level. Our experimental results are consistent with the general features predicted by first principles calculations.
Authors:
; ;  [1] ; ;  [1] ;  [2] ;  [2] ;  [1] ;  [2]
  1. Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan (China)
  2. (China)
Publication Date:
OSTI Identifier:
22489341
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 4; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EXCITATION; FERMI LEVEL; NANOSTRUCTURES; PHOTOCONDUCTIVITY; PHOTOLUMINESCENCE; THIN FILMS; ZINC OXIDES