光谱学与光谱分析 |
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Study of Cubic Boron Nitride Crystal UV Absorption Spectroscopy |
LIU Hai-bo1,JIA Gang1,CHEN Gang2,MENG Qing-ju1,ZHANG Tie-chen3 |
1. State Key Laboratory of Integrated Optical-Electronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China 2. Department of Materials Science and Engineering, Jilin University, Changchun 130012, China 3. State Key Laboratory of Super Hard Materials, Jilin University, Changchun 130012, China |
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Abstract UV absorption spectroscopy of artificial cubic boron nitride (cBN) single crystal flake, synthesized under high-temperature and high-pressure, was studied in the present paper. UV WINLAB spectrometer was used in the experiments, and MOLECULAR SPECTROSCOPY software was used for data analysis. The UV-cBN limit of 198 nm was showed in this test by a special fixture quartz sample. We calculated the energy gap by virtue of the formula:λ0=1.24/Eg (μm). The energy gap is 6.26 eV. There are many viewpoints about the gap of cBN. By using the first-principles theory to calculate energy band structure and density of electronic states of cBN, an indirect transition due to electronics in valence band jumping into conduction band by absorbing photon can be confirmed. That leads to UV absorption. The method of calculation was based on the quantum mechanics of CASTEP in the commercial software package of Cerius2 in the Co. Accerlrys in the United States. The theory of CASTEP is based on local density approximation or gradient corrected LDA.The crystal parameter of cBN was input to the quantum mechanics of CASTEP in order to construct the crystal parameter model of cBN. We calculated the energy gap of cBN by the method of gradient corrected LDA. The method underestimates the value of nonconductor by about 1 to 2 eV. We gaot some opinions as follows:cBN is indirect band semiconductor. The energy gap is 4.76 eV, less than our experiment. The reason may be defect that we ignored in calculating process. It was reported that the results by first principles method of calculation of the band generally was less than the experimental results. This paper shows good UV characteristics of cBN because of the good agreement of experimental results with the cBN band width. That is a kind of development prospect of UV photo-electronic devices and high-temperature semiconductor devices.
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Received: 2008-01-02
Accepted: 2008-03-28
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Corresponding Authors:
LIU Hai-bo
E-mail: liuhaibo209@163.com
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