Chin. Phys. Lett.  2011, Vol. 28 Issue (3): 037102    DOI: 10.1088/0256-307X/28/3/037102
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Cathodoluminescence of Yellow and Blue Luminescence in Undoped Semi-insulating GaN and n-GaN
HOU Qi-Feng1**, WANG Xiao-Liang1,2, XIAO Hong-Ling1,2, WANG Cui-Mei1,2, YANG Cui-Bai1,2, YIN Hai-Bo1, LI Jin-Min1, WANG Zhan-Guo2
1Materials Science Center, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083
2Key Laboratory of Semiconductor Materials Science, Chinese Academy of Sciences, PO Box 912, Beijing 100083
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Abstract Yellow and blue luminescence in undoped GaN layers with different resistivities are studied by cathodoluminescence. Intense yellow and blue luminescence bands are observed in semi-insulating GaN, while in n-GaN the yellow luminescence and blue luminescence bands are very weak. The stronger yellow and blue luminescences in semi-insulating GaN are correlated to the higher edge-type dislocation density. The scanning cathodoluminescence image reveals strong defect-related luminescence at the grain boundaries where the dislocations accumulate. It is found that the relative intensity of the blue luminescence band to the yellow luminescence band increases with the cathodoluminescence beam energies and is larger in n-GaN with a lower density of edge-type dislocations. An approximately 3.35 eV shoulder next to the near-band-edge peak is observed in n-GaN but not in semi-insulating GaN. A redshift of the near-band-edge peak with cathodoluminescence beam energy is observed in both samples and is explained by internal absorption.
Keywords: 71.55.Eq      78.60.Hk      81.15.Gh     
Received: 29 November 2010      Published: 28 February 2011
PACS:  71.55.Eq (III-V semiconductors)  
  78.60.Hk (Cathodoluminescence, ionoluminescence)  
  81.15.Gh (Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.))  
Cite this article:   
HOU Qi-Feng, WANG Xiao-Liang, XIAO Hong-Ling et al  2011 Chin. Phys. Lett. 28 037102
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http://cpl.iphy.ac.cn/10.1088/0256-307X/28/3/037102       OR      http://cpl.iphy.ac.cn/Y2011/V28/I3/037102
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HOU Qi-Feng
WANG Xiao-Liang
XIAO Hong-Ling
WANG Cui-Mei
YANG Cui-Bai
YIN Hai-Bo
LI Jin-Min
WANG Zhan-Guo
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