Photoluminescence Study of GaN |
X. Zhang, P. Kung, A. Saxler, D. Walker, Τ. Wang and M. Razeghi Center for Quantum Devices, Department of Electrical Engineering and Computer Science Northwestern University, Evanston. IL 60208, USA |
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Photoluminescence study of undoped, doped GaN grown on (00.1), (11.0), (01.2)Al2O3 (100), (111)Si, and (00.1)6H-SiC substrates have been conducted. Strong bandedge emissions from all undoped samples and dopant-related emissions from doped samples were observed. Deep-level yellow emission centered around 2.2 eV was not observed from undoped GaN grown on 6H-SiC substrate, undoped GaN with optimum Ga source flow and doped GaN. The experiment data strongly suggest that Ga vacancies are the origin this deep-level emission. |
DOI: 10.12693/APhysPolA.88.601 PACS numbers: 71.55.Eq, 68.55.-a, 78.66.-w |