Calculation of positron annihilation characteristics of six main defects in 6H -SiC and the possibility to distinguish them experimentally

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2016-07-06
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Language
en
Pages
1-11
Series
PHYSICAL REVIEW B, Volume 94, issue 1
Abstract
We have determined positron annihilation characteristics (lifetime and Doppler broadening) in six basic vacancy-type defects of 6H-SiC and two nitrogen-vacancy complexes using ab initio calculations. The positron characteristics obtained allow us to point out which positron technique in the most adapted to identify a particular defect. They show that the coincidence Doppler broadening technique is the most relevant for observing the silicon vacancy-nitrogen complexes, VSiNC, and carbon vacancy-carbon antisite ones, VCCSi. For the other studied defects, the calculated positron characteristics are found to be too close for the defects to be easily distinguished using a single positron annihilation technique. Then it is required to use complementary techniques, positron annihilation based or other.
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Linez , F , Makkonen , I & Tuomisto , F 2016 , ' Calculation of positron annihilation characteristics of six main defects in 6H -SiC and the possibility to distinguish them experimentally ' , Physical Review B , vol. 94 , no. 1 , 014103 , pp. 1-11 . https://doi.org/10.1103/PhysRevB.94.014103