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With isothermal annealing treatment at 1873 K, unintentionally doped 4H-SiC epitaxial layers grown by low-pressure chemical vapor deposition (LPCVD) have been studied using electron spin resonance (ESR) and low temperature photoluminescence (PL). ESR and PL spectra show that the native defects are the mixture of carbon vacancy (VC) and its extended point defects. The decrease of key parameter g vector...
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