期刊
APPLIED SURFACE SCIENCE
卷 256, 期 11, 页码 3592-3597出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.12.160
关键词
ZnO nanorods; Optical properties; Surface recombination; X-ray photoelectron spectroscopy
类别
资金
- Swedish Research Council (VR)
- Swedish Research Links via VR
- National Nature Science Foundation of China (NNSFC) [60878039, 60778040]
- Program for the Development of Science and Technology of Jilin Province [20090140]
- Eleventh Five-Year Program for Science and Technology of Education Department of Jilin Province [20080156]
The surface composition of as-grown and annealed ZnO nanorods arrays (ZNAs) grown by a two-step chemical bath deposition method has been investigated by X-ray photoelectron spectroscopy (XPS). XPS confirms the presence of OH bonds and specific chemisorbed oxygen on the surface of ZNAs, as well as H bonds on (1 0 (1) over bar 0) surfaces which has been first time observed in the XPS spectra. The experimental results indicated that the OH and H bonds play the dominant role in facilitating surface recombination but specific chemisorbed oxygen also likely affect the surface recombination. Annealing can largely remove the OH and H bonds and transform the composition of the other chemisorbed oxygen at the surface to more closely resemble that of high temperature grown ZNAs, all of which suppresses surface recombination according to time-resolved photoluminescence measurements. (C) 2009 Elsevier B. V. All rights reserved.
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