Abstract

GaN epilayer grown on Sapphire by MOCVD technique has been irradiated with 75 MeV Sn 5+ ions to a fluence of 1×10 11, 10 12, 10 13 and 10 14 cm −2 and studied using depth-resolved positron annihilation spectroscopy. High-energy ion-induced defects are found to be Ga mono vacancies, which have been identified from the defect sensitive S-parameter values as well as from R-parameter values, for all fluence beyond 10 11 cm −2. It is also found that the concentration of vacancy defects increases with ion fluence.

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