| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Structural Analysis of In xGa1−xN/GaN MQWs by Different Experimental Methods |
| DING Bin-Beng1,2, PAN Feng1,3, FENG Zhe-Chuan4, FA Tao1, CHENG Feng-Feng1, YAO Shu-De1**
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1State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871
2Department of Physics and Electronic Information, Langfang Teachers College, Langfang 065000
3Department of Physics, Shaanxi University of Technology, Hanzhong 723001
4Institute of Photonics & Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taipei 10617
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| Cite this article: |
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DING Bin-Beng, PAN Feng, FENG Zhe-Chuan et al 2011 Chin. Phys. Lett. 28 078201 |
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Abstract Structural properties of InxGa1−xN/GaN multi-quantum wells (MQWs) grown on sapphire by metal organic chemical vapor deposition are investigated by synchrotron radiation x-ray diffraction (SRXRD), Rutherford backscattering/channelling (RBS/C) and high-resolution transmission electron microscopy. The sample consists of eight periods of InxGa1−xN/GaN wells of 2.1 nm thickness and 8.5 nm thickness of GaN barrier, and the results are very close, which verifies the accuracy of the three methods. The indium content in InxGa1−xN/GaN MQWs by SRXRD and RBS/C is estimated, and results are in general the same. By RBS/C random spectra, the indium atomic lattice substitution rate is 94.0%, indicating that almost all indium atoms in InxGa1−xN/GaN MQWs are at substitution, that the indium distribution of each layer in InxGa1−xN/GaN MQWs is very homogeneous and that the InxGa1−xN/GaN MQWs have a very good crystalline quality. It is not accurate to estimate indium content in InxGa1−xN/GaN MQWs by photoluminescence (PL) spectra, because the result from the PL experimental method is very different from the results by the SRXRD and RBS/C experimental methods.
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| Keywords:
82.33.Ya
73.21.Fg
61.05.Cp
68.37.Og
29.40.-n
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Received: 02 March 2011
Published: 29 June 2011
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| PACS: |
82.33.Ya
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(Chemistry of MOCVD and other vapor deposition methods)
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73.21.Fg
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(Quantum wells)
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61.05.cp
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(X-ray diffraction)
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68.37.Og
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(High-resolution transmission electron microscopy (HRTEM))
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29.40.-n
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(Radiation detectors)
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