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Open AccessArticle

Role of Si and C Impurities in Yellow and Blue Luminescence of Unintentionally and Si-Doped GaN

1
State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3
Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 1026; https://doi.org/10.3390/nano8121026
Received: 1 November 2018 / Revised: 1 December 2018 / Accepted: 7 December 2018 / Published: 10 December 2018
Both yellow luminescence (YL) and blue luminescence (BL) bands of GaN films have been investigated for decades, but few works report the relationship between them. In this study, two sets of GaN samples grown via metalorganic chemical vapor deposition (MOCVD) were investigated. A close relationship was found between the YL and BL bands for unintentionally doped GaN and Si-doped GaN samples, both of which were grown without intentional acceptor doping. It was found that the intensity ratio of blue luminescence to yellow luminescence (IBL/IYL) decreases sharply with the increase in carbon impurity concentration, even though both IBL and IYL increase obviously. It was also found that IBL/IYL decreases sharply with the increase in Si doping concentration. It is suggested that the C and Si impurities play important role in linkage and competition of the blue and yellow luminescence. View Full-Text
Keywords: GaN; yellow luminescence; blue luminescence; carbon impurity; Si impurity GaN; yellow luminescence; blue luminescence; carbon impurity; Si impurity
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Liang, F.; Zhao, D.; Jiang, D.; Liu, Z.; Zhu, J.; Chen, P.; Yang, J.; Liu, S.; Xing, Y.; Zhang, L. Role of Si and C Impurities in Yellow and Blue Luminescence of Unintentionally and Si-Doped GaN. Nanomaterials 2018, 8, 1026.

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