Reflective second harmonic generation from ZnO thin films: A study on the Zn-O bonding

Kuang Yao Lo, Yi Jen Huang, Jung Y. Huang, Zhe Chuan Feng*, William E. Fenwick, Ming Pan, Ian T. Ferguson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The structures of the Zn-O bonding in ZnO (0002) thin films prepared by metal organic chemical vapor deposition have been studied by reflective second harmonic generation (RSHG). The polar Zn-O bond on the top layer is not canceled out and presents 3 mm symmetrical structures on the well-grown ZnO (0002) surface. The average polar strength of the Zn-O bond is correlated with the quality of the ZnO (0002) thin film. The mirror symmetry is caused by the nonvanished polar of twin boundary due to the mismatch between the ZnO film and sapphire substrate and analyzed using s-polarized RSHG with s-polarized fundamental light irradiation. These results demonstrate that the Zn-O heteropolar bonds on the smooth ZnO surface contribute to the SHG intensity.

Original languageEnglish
Article number161904
JournalApplied Physics Letters
Volume90
Issue number16
DOIs
StatePublished - 30 Apr 2007

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