期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 590, 期 -, 页码 260-265出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.12.106
关键词
Spontaneous oxidation; ZnO nanostructures; Band-gap emission; Heterojunction; Photodetector
资金
- Natural Science Foundation of China [61176049]
- Program for New Century Excellent Talents in Fujian Province University (NCETFJ)
- China Scholarship Council (CSC)
ZnO nanostructures have been synthesized on p-type silicon substrates using a two-step, spontaneous oxidation of Zn films method at room temperature. The samples both with and without a thin layer of gold in different positions have been spontaneously oxidized in a humid atmosphere for seven days to form nanosheets and ball-cactus like nanostructures. Diverse morphologies of hierarchical ZnO nanostructures have been obtained by annealing the samples at 700 degrees C in a nitrogen atmosphere for 1 h. A growth mechanism has been proposed for the formation of different ZnO nanostructures. It was found that the band-gap emission can be greatly improved and that the defect emission is suppressed to a noise level when a thin layer of Au was deposited between the Zn and the Si substrate. Moreover, our results show that the ZnO/p-Si heterojunction exhibits good performance for visible spectrum detection. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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