Photoluminescence characteristics of high quality ZnO nanowires and its enhancement by polymer covering

K. W. Liu, R. Chen, G. Z. Xing, Tao Wu, H. D. Sun

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

We investigated the photoluminescence (PL) properties of ZnO nanowires with and without covering with polymethyl methacrylate (PMMA). Low temperature PL spectra of as-grown ZnO nanowires are dominated by near band edge (NBE) emission due to donor bound excitons and free-to-bound recombination (FB). FB emission persists till 300 K and together with free exciton emission governs the lineshape of the PL spectra. After covering with PMMA, the integral intensity of NBE emission increases about three times, indicating significantly improved excitonic emission efficiency. A model based on surface states and energy bands theory was proposed to interpret this emission enhancement.

Original languageEnglish (US)
Article number023111
JournalApplied Physics Letters
Volume96
Issue number2
DOIs
StatePublished - Jan 25 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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