Antisites in silicon carbide
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© 1998 American Physical Society (APS). This is the accepted version of the following article: Torpo, L. & Pöykkö, S. & Nieminen, Risto M. 1998. Antisites in silicon carbide. Physical Review B. Volume 57, Issue 11. 6243-6246. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.57.6243, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.57.6243.
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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6243-6246
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Physical Review B, Volume 57, Issue 11
Abstract
Ten years ago, deep-level-transient-spectroscopy (DLTS) signals, assigned to centers labeled as H1, H2, H3, and E2, have been detected in neutron-irradiated 3C SiC. The H centers were believed to be the primary point defects and the E2 center a secondary defect, which forms after the H centers start to migrate. A conclusive identification of these signals has not been presented so far. We present computational evidence that the H centers are due to silicon antisite defects (SiC). In both cubic (3C) and hexagonal (2H) polytypes, the silicon antisite has several ionization levels in the band gap. The positions of these ionization levels in 3C SiC have been calculated accurately with the plane wave pseudopotential method using a large 128-atom site supercell, and compared with the DLTS spectrum. A very good agreement with experimental data indicates that H centers are due to the formation of SiC during neutron irradiation. The formation energies and local geometries of the antisite defects in SiC are also reported.Description
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Torpo, L. & Pöykkö, S. & Nieminen, Risto M. 1998. Antisites in silicon carbide. Physical Review B. Volume 57, Issue 11. 6243-6246. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.57.6243.