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Chinese Physics, 2007, Vol. 16(9): 2786-2790    DOI: 10.1088/1009-1963/16/9/048
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

GaN layers with different polarities prepared by radio frequency molecular beam epitaxy and characterized by Raman scattering

Zhong Fei(钟飞), Li Xin-Hua(李新化), Qiu Kai(邱凯), Yin Zhi-Jun(尹志军), Ji Chang-Jian(姬长建), Cao Xian-Cun(曹先存), Han Qi-Feng(韩奇峰), Chen Jia-Rong(陈家荣), and Wang Yu-Qi(王玉琦)
Key Laboratory of Material Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
Abstract  GaN layers with different polarities have been prepared by radio-frequency molecular beam epitaxy (RF-MBE) and characterized by Raman scattering. Polarity control are realized by controlling Al/N flux ratio during high temperature AlN buffer growth. The Raman results illustrate that the N-polarity GaN films have frequency shifts at $A_{1}$(LO) mode because of their high carrier density; the forbidden $A_{1}$(TO) mode occurs for mixed-polarity GaN films due to the destroyed translation symmetry by inversion domain boundaries (IDBS); Raman spectra for Ga-polarity GaN films show that they have neither frequency shifts mode nor forbidden mode. These results indicate that Ga-polarity GaN films have a better quality, and they are in good agreement with the results obtained from the room temperature Hall mobility. The best values of Ga-polarity GaN films are 1042 cm$^{2}$/Vs with a carrier density of 1.0$\times $10$^{17}$ cm$^{ - 3}$.
Keywords:  polarity      gallium nitride      Raman scattering  
Received:  11 December 2006      Revised:  15 February 2007      Accepted manuscript online: 
PACS:  81.15.Hi (Molecular, atomic, ion, and chemical beam epitaxy)  
  63.20.-e (Phonons in crystal lattices)  
  68.55.A- (Nucleation and growth)  
  78.30.Fs (III-V and II-VI semiconductors)  
  78.66.Fd (III-V semiconductors)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10574130).

Cite this article: 

Zhong Fei(钟飞), Li Xin-Hua(李新化), Qiu Kai(邱凯), Yin Zhi-Jun(尹志军), Ji Chang-Jian(姬长建), Cao Xian-Cun(曹先存), Han Qi-Feng(韩奇峰), Chen Jia-Rong(陈家荣), and Wang Yu-Qi(王玉琦) GaN layers with different polarities prepared by radio frequency molecular beam epitaxy and characterized by Raman scattering 2007 Chinese Physics 16 2786

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