Electronic structures of polycrystalline ZnO thin films probed by electron energy loss spectroscopy

H. C. Ong, J. Y. Dai, K. C. Hung, Y. C. Chan, Robert P. H. Chang, S. T. Ho

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The microstructure of polycrystalline ZnO thin films grown on amorphous fused quartz has been studied by transmission electron microscopy and electron energy loss spectroscopy (EELS). The optical functions of the grain and grain boundary of ZnO acquired from EELS are compared to elucidate the mechanism of the formation of self-assemble laser cavities within this material. It is found that the refractive index of the grain boundary is significantly lower than that of the grain due to the lack of excitonic resonance. This large refractive index difference between the grain and grain boundary substantiates the scenario that the formation of laser cavities is caused by the strong optical scattering facilitated in a highly disordered crystalline structure. In addition, our results also imply that the optical characteristics of ZnO have very high tolerance on defects.

Original languageEnglish
Pages (from-to)1484-1486
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number10
Publication statusPublished - Sep 4 2000

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grain boundaries
energy dissipation
electron energy
electronic structure
laser cavities
thin films
refractivity
spectroscopy
quartz
transmission electron microscopy
microstructure
defects
scattering
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Ong, H. C., Dai, J. Y., Hung, K. C., Chan, Y. C., Chang, R. P. H., & Ho, S. T. (2000). Electronic structures of polycrystalline ZnO thin films probed by electron energy loss spectroscopy. Applied Physics Letters, 77(10), 1484-1486.

Electronic structures of polycrystalline ZnO thin films probed by electron energy loss spectroscopy. / Ong, H. C.; Dai, J. Y.; Hung, K. C.; Chan, Y. C.; Chang, Robert P. H.; Ho, S. T.

In: Applied Physics Letters, Vol. 77, No. 10, 04.09.2000, p. 1484-1486.

Research output: Contribution to journalArticle

Ong, H. C. ; Dai, J. Y. ; Hung, K. C. ; Chan, Y. C. ; Chang, Robert P. H. ; Ho, S. T. / Electronic structures of polycrystalline ZnO thin films probed by electron energy loss spectroscopy. In: Applied Physics Letters. 2000 ; Vol. 77, No. 10. pp. 1484-1486.
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