Defect Formation Energies of Interstitial C, Si, and Ge Impurities in beta-Ga2O3

Formation energies of C, Si, and Ge defects in beta-Ga2O3 are studied through hybrid functional calculations. The interstitial defects of these elements generally occur at higher energies than their substitutional counterparts, but are more stable at low Fermi energies in Ga-rich conditions, with their range of stability increasing from Ge and Si to C. In n-type and Ga-rich conditions, interstitials of Si and Ge show significantly higher formation energies than their substitutional form, but this difference is less pronounced for C. Charge transition levels of interstitial defects lie in the upper part of the band-gap, and account for several measured levels in unintentionally doped and Ge-doped samples of beta-Ga2O3.


Published in:
Physica Status Solidi-Rapid Research Letters, 13, 8, 1800633
Year:
Aug 01 2019
Publisher:
Weinheim, WILEY-V C H VERLAG GMBH
ISSN:
1862-6254
1862-6270
Keywords:
Laboratories:




 Record created 2019-08-28, last modified 2019-08-30


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