Origin of Centres Involved in Blue and Orange Luminescence of 6H-SiC
A. Wysmołek, J.M. Baranowski and M. Kamińska
Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warszawa, Poland
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We present new results of luminescence of n-type 6H-SiC crystals. We have found two shallow donors with ionization energies at 60 meV and 140 meV. We have shown that the blue luminescence is not affected by the ionization of the shallower donor and is related to deeper donor which we attribute to N at C-site. We propose that the origin of the more shallower donor at 60 meV is related to carbon vacancy. We have found that the intensity of the orange luminescence increases under infrared illumination. This result confirms that the orange luminescence is due to conduction band-deep centre transitions. We believe that deep centre responsible for the orange luminescence is the silicon vacancy.
DOI: 10.12693/APhysPolA.88.957
PACS numbers: 78.55.-m, 78.20.-e, 78.60.Kn