Carbon defects as sources of the green and yellow luminescence bands in undoped GaN

Article

关键词: DOPED GAN;    DOMINANT ACCEPTOR;    PHOTOLUMINESCENCE;    VACANCIES;    MOBILITY;    ENERGY;    OXYGEN;   

DOI  :  10.1103/PhysRevB.90.235203

来源: SCIE

【 摘 要 】

In high-purity GaN grown by hydride vapor phase epitaxy, the commonly observed yellow luminescence (YL) band gives way to a green luminescence (GL) band at high excitation intensity. We propose that the GL band with a maximum at 2.4 eV is caused by transitions of electrons from the conduction band to the 0/+ level of the isolated C-N defect. The YL band, related to transitions via the -/0 level of the same defect, has a maximum at 2.1 eV and can be observed only for some high-purity samples. However, in less pure GaN samples, where no GL band is observed, another YL band with a maximum at 2.2 eV dominates the photoluminescence spectrum. The latter is attributed to the CNON complex.

【 授权许可】

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