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Paper Abstract and Keywords
Presentation 2015-11-26 15:55
Determination of internal quantum efficiency in GaN by simultaneous measurements of photoluminescence and photo-acoustic signals
Takashi Nakano, Kouhei Kawakami, Atsushi A. Yamaguchi (KIT) ED2015-78 CPM2015-113 LQE2015-110 Link to ES Tech. Rep. Archives: ED2015-78 CPM2015-113 LQE2015-110
Abstract (in Japanese) (See Japanese page) 
(in English) Internal quantum efficiency (IQE) is usually estimated from temperature dependence of photoluminescence (PL) intensity by assuming that the IQE at cryogenic temperature is unity. III-nitride samples, however, usually have large defect-density, and the assumption is not necessarily valid. In this study, we developed a new method to estimate accurate IQE values by simultaneous PL and photo-acoustic (PA) measurements, and demonstratively evaluated the IQE values for various GaN samples. The results show that the conventional method cannot give accurate IQE values for low-quality samples although it can be valid for high-quality samples, and that our method can always give accurate values.
Keyword (in Japanese) (See Japanese page) 
(in English) GaN / Photo-acoustic / Internal quantum efficiency / temperature dependence of photoluminescence intensity / Non-radiative recombination / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 331, LQE2015-110, pp. 53-58, Nov. 2015.
Paper # LQE2015-110 
Date of Issue 2015-11-19 (ED, CPM, LQE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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Download PDF ED2015-78 CPM2015-113 LQE2015-110 Link to ES Tech. Rep. Archives: ED2015-78 CPM2015-113 LQE2015-110

Conference Information
Committee ED LQE CPM  
Conference Date 2015-11-26 - 2015-11-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka City University Media Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Nitride Semiconductor Devices, Materials, Related Technologies 
Paper Information
Registration To LQE 
Conference Code 2015-11-ED-LQE-CPM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Determination of internal quantum efficiency in GaN by simultaneous measurements of photoluminescence and photo-acoustic signals 
Sub Title (in English)  
Keyword(1) GaN  
Keyword(2) Photo-acoustic  
Keyword(3) Internal quantum efficiency  
Keyword(4) temperature dependence of photoluminescence intensity  
Keyword(5) Non-radiative recombination  
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1st Author's Name Takashi Nakano  
1st Author's Affiliation Kanazawa Institute of Technology (KIT)
2nd Author's Name Kouhei Kawakami  
2nd Author's Affiliation Kanazawa Institute of Technology (KIT)
3rd Author's Name Atsushi A. Yamaguchi  
3rd Author's Affiliation Kanazawa Institute of Technology (KIT)
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Speaker Author-1 
Date Time 2015-11-26 15:55:00 
Presentation Time 25 minutes 
Registration for LQE 
Paper # ED2015-78, CPM2015-113, LQE2015-110 
Volume (vol) vol.115 
Number (no) no.329(ED), no.330(CPM), no.331(LQE) 
Page pp.53-58 
#Pages
Date of Issue 2015-11-19 (ED, CPM, LQE) 


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