期刊
CARBON
卷 153, 期 -, 页码 381-388出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.07.041
关键词
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资金
- National Science Fund for Distinguished Young Scholars [51625201]
- National Key Research and Development Program of China [2016YFE0201600]
- National Natural Science Foundation of China [51702066]
- Key Laboratory of Micro-systems and Micro-structures Manufacturing, Ministry of Education, Harbin Institute of Technology [2016KM001]
- Major State Basic Search Program [2014CB46505]
It has been widely accepted that conversion between negatively charged nitrogen-vacancy (NV-) center and neutral nitrogen-vacancy (NV0) center can be realized with the Fermi level crossing the transition level corresponding to the ground state of NV-. In this study, a suppressing effect was observed in the emission of NV- center; however, emission of NV0 center was not observed to be increasing as expected and was stable when lowering of the Fermi level was induced by a Schottky junction between gold and oxygen-terminated diamond containing NV centers. The relationship between the thickness of the depletion layer as well as that of the suppression layer, appearing when the Fermi level shifted below the ground state level of NV-, and the donor concentration was derived. Moreover, a model based on the assumption that an intermediate transition level (nonfluorescence state) existed between the ground state energy levels of NV- and NV0, was proposed to explain why suppressed NV- did not convert to NV0. The results of this study will aid in further understanding of the characteristics of NV centers. In addition, a Schottky junction can be developed to determine the charge state of unknown color centers and facilitate study of defects in diamonds. (C) 2019 Elsevier Ltd. All rights reserved.
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