Raman probing of competitive laser heating and local recrystallization effect in ZnO nanocrystals

J D Ye, P Parkinson, F F Ren, S L Gu, H H Tan, C Jagadish

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The competitive laser-induced local heating and recrystallization effects in ZnO nanocrystals embedded in a MgO/ZnO stack are reported via resonance Raman spectra. The dependence of the intensity, energy, and resonance effects of the longitudinal optical (LO) phonon on laser excitation condition are discussed in the context of Fröhlich interaction. Redistribution of defects, impurity-diffusion, and grain regrowth caused by thermal and photochemical effects lead to significant changes in coupling strength of electron-phonon interaction, and the resonance behaviors are strongly affected by the interplay of local heating, heat trapping, and local structural modification in such nanostructures.
    Original languageEnglish
    Pages (from-to)23281-9
    Number of pages23271
    JournalOptics Express
    Volume20
    Issue number21
    DOIs
    Publication statusPublished - Oct 2012

    Keywords

    • Zinc Oxide: radiation effects

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