Probing Surface Structure Quality of ZnO Nanorods by Second Harmonic Generation

Author

Chung-Wei Liu ; Shoou-Jinn Chang ; Chih-Hung Hsiao ; Ruei-Jie Huang ; Yan-Shen Lin ; Min-Chia Su ; Peng-Han Wang ; Kuang-Yao Lo

Author_Institution

Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

Volume

26

Issue

8

fYear

2014

fDate

15-Apr-14

Firstpage

789

Lastpage

792

Abstract

The surface quality of ZnO nanorod after postannealing was inspected by second harmonic generation (SHG) with the assistance of photoluminescence (PL) spectra, and the X-ray photoelectron (XPS) spectroscopy. The SHG is sensitive to the quality of the surface structure, which involves the elimination of surface defects and restructuring. Oxygen (O)-deficient defects and surface defects were generated during the growth of ZnO nanorods. The PL and XPS analyses indicate that the surface defects on ZnO nanorods were reduced at annealing temperatures above 600 ^°C. The bulk crystal structure was repaired for higher activation temperatures (> 700^°C) concluded by X-ray diffraction. Results from SHG revealed the relationship between surface restructuring of ZnO nanorods and annealing temperature.

Keywords

II-VI semiconductors; X-ray diffraction; X-ray photoelectron spectra; annealing; nanorods; optical harmonic generation; photoluminescence; surface structure; zinc compounds; SHG; X-ray diffraction; X-ray photoelectron spectroscopy; XPS; ZnO; activation temperatures; annealing temperature; bulk crystal structure; nanorods; oxygen-deficient defects; photoluminescence spectra; postannealing; second harmonic generation; surface defects; surface restructuring; surface structure quality; Annealing; Lattices; Surface morphology; Surface structures; Surface treatment; X-ray scattering; Zinc oxide; SHG; ZnO; annealing; nanorod;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2306428

Filename

6740826