Chin. Phys. Lett.  2018, Vol. 35 Issue (1): 016101    DOI: 10.1088/0256-307X/35/1/016101
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Surface Carbonization of GaN and the Related Structure Evolution during the Annealing Process
Jin-Long Liu1, Liang-Xian Chen1, Jun-Jun Wei1, Li-Fu Hei1, Xu Zhang2, Cheng-Ming Li1**
1Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083
2Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing Radiation Center, Beijing 100875
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Jin-Long Liu, Liang-Xian Chen, Jun-Jun Wei et al  2018 Chin. Phys. Lett. 35 016101
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Abstract To explain the stabilization mechanism of the carbon-ion-implanted GaN under the diamond growth environment, the luminescence characteristics and structure evolution correlative with sites' carbon atoms located for high-fluence carbon-ion-implanted GaN are discussed. GaN is implanted with carbon ion using fluence of $2\times10^{17}$ cm$^{-2 }$ and energy of 45 keV. Then the implanted samples are annealed at 800$^{\circ}\!$C for 20 min and 1 h under the N$_{2}$ atmosphere. The luminescence characteristics of carbon-ion-implanted GaN are evaluated by photoluminescence spectrum at wavelength 325 nm. The lattice damage of GaN is characterized by Raman spectrum and the corresponding vacancy-defect evolution before and after annealing is measured by slow positron annihilation. The results show that most of the carbon atoms will be located at the interstitial sites after carbon ion implantation due to the weak mobility. As the implanted samples are annealed, strong yellow luminescence is emitted and the vacancies for Ga (V$_{\rm Ga})$ are reduced resulting from the migration of interstitial carbon (C$_{\rm i})$ and formation of complexes (C$_{\rm Ga}$ and/or C$_{\rm Ga}$-C$_{\rm i}$) between them. As the annealing time is prolonged, the carbon ions accommodated by the vacancies are saturated, vacancy clusters with carbon atoms appear and the concentration of C$_{\rm Ga}$ diminishes, which will have an adverse effect on the diamond film nucleation and growth.
Received: 21 September 2017      Published: 17 December 2017
PACS:  61.66.Fn (Inorganic compounds)  
  61.72.jd (Vacancies)  
  61.72.uj (III-V and II-VI semiconductors)  
  61.80.Jh (Ion radiation effects)  
Fund: Supported by the National Natural Science Foundation of China under Grant No 51402013, the National Key Research and Development Program of China under Grant No 2016YFE0133200, and the European Union's Horizon 2020 Research and Innovation Staff Exchange Scheme under Grant No 734578.
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https://cpl.iphy.ac.cn/10.1088/0256-307X/35/1/016101       OR      https://cpl.iphy.ac.cn/Y2018/V35/I1/016101
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Jin-Long Liu
Liang-Xian Chen
Jun-Jun Wei
Li-Fu Hei
Xu Zhang
Cheng-Ming Li
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