Photocurrent of an individual ZnO nanorods synthesized by sol-gel route on a pulse laser deposited ZnO film

Seung Eon Ahn, Gyu Tae Kim, Hyunsuk Kim, Sangsig Kim, Jeong Sook Ha, Jong Soo Lee, Chang Hyun Bae, Seung Min Park

Research output: Contribution to journalConference article

Abstract

ZnO nanorods were grown on SiO2/Si substrates and ZnO thin film by a sol-gel method at low temperatures of around T = 95°C. The diameters and the lengths of ZnO nanorods increased at high concentrations of zinc nitrate hexahydrate and methenamine solution. And the grain size of ZnO film is strongly correlated with the shape and the diameters of synthesized ZnO nanorods. Current-voltage characteristics of the ZnO nanorod followed a typical nonlinear behavior with significant photoresponse below λ=400 nm in air, and the conductance was enhanced in vacuum with the decrease of the absolute magnitudes of the photocurrent. In photoluminescence (PL) and photocurrent (PC) spectra, the PL peak (λpeak=380 nm and 3.26 eV) did not match the PC edge (λedge=400 nm and 3.1 eV), indicating the nondirect band-gap transition in photocurrent. The origin of the photocurrent was discussed from the point of the influence of desorption of adsorbed water molecules on the surface or inside the ZnO nanorods.

Original languageEnglish
Article numberL5.8
Pages (from-to)113-118
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume836
Publication statusPublished - 2005
Event2004 Materials Research Society Fall Meeting - Boston, MA, United States
Duration: 2004 Nov 292004 Dec 2

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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