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Chin. Phys. B, 2013, Vol. 22(2): 028101    DOI: 10.1088/1674-1056/22/2/028101

Study on the relationships between Raman shifts and temperature range for a-plane GaN using temperature-dependent Raman scattering

Wang Dang-Huia b, Xu Sheng-Ruia, Hao Yuea, Zhang Jin-Chenga, Xu Tian-Hanb, Lin Zhi-Yua, Zhou Haoa, Xue Xiao-Yonga
a State Key Laboratory of Fundamental Science on Wide Band-Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an 710071, China;
b School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China
Abstract  In this paper, Raman shifts of a-plane GaN layers grown on r-plane sapphire substrates by low-pressure metal-organic chemical vapor deposition (LPMOCVD) are investigated. We compare the crystal qualities and study the relationships between Raman shift and temperature for conventional a-plane GaN epilayer and insertion AlN/AlGaN superlattice layers for a-plane GaN epilayer using temperature-dependent Raman scattering in a temperature range from 83 K to 503 K. The temperature-dependences of GaN phonon modes (A1 (TO), E2 (high), and E1 (TO)) and the linewidths of E2 (high) phonon peak are studied. The results indicate that there exist two mechanisms between phonon peaks in the whole temperature range, and the relationship can be fitted to the pseudo-Voigt function. From analytic results we find a critical temperature existing in the relationship, which can characterize the anharmonic effects of a-plane GaN in different temperature ranges. In the range of higher temperature, the relationship exhibits an approximately linear behavior, which is consistent with the analyzed results theoretically.
Keywords:  metal-organic chemical vapor deposition      Raman shift      crystal quality      anharmonic effect  
Received:  29 April 2012      Revised:  09 August 2012      Published:  01 January 2013
PACS:  81.15.Kk (Vapor phase epitaxy; growth from vapor phase)  
  78.55.Cr (III-V semiconductors)  
Fund: Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. K50511250002); the National Key Science & Technology Special Project, China (Grant No. 2008ZX01002-002); the Major Program and State Key Program of the National Natural Science Foundation of China (Grant Nos. 60890191 and 60736033); and the Science Fund for Youths Scholars (Grant Nos. 61204006).
Corresponding Authors:  Wang Dang-Hui     E-mail:

Cite this article: 

Wang Dang-Hui, Xu Sheng-Rui, Hao Yue, Zhang Jin-Cheng, Xu Tian-Han, Lin Zhi-Yu, Zhou Hao, Xue Xiao-Yong Study on the relationships between Raman shifts and temperature range for a-plane GaN using temperature-dependent Raman scattering 2013 Chin. Phys. B 22 028101

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