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Identification of a Frenkel-pair defect in electron-irradiated 3C SiC

Nguyen, Son Tien (author)
Linköpings universitet,Halvledarmaterial,Tekniska högskolan,Semiconductor materials
Janzén, Erik (author)
Linköpings universitet,Halvledarmaterial,Tekniska högskolan,Semiconductor materials
Isoya, J. (author)
University of Tsukuba
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Morishita, N. (author)
Japan Atomic Energy Agency
Hanaya, H. (author)
Japan Atomic Energy Agency
Takizawa, H. (author)
Japan Atomic Energy Agency
Ohshima, T. (author)
Japan Atomic Energy Agency
Gali, Adam (author)
Linköpings universitet,Halvledarmaterial,Tekniska högskolan
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 (creator_code:org_t)
2009
2009
English.
In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 80, s. 125201-
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Anelectron paramagnetic resonance (EPR) spectrum labeled LE1 was observed inn-type 3C SiC after electron irradiation at low temperatures (~80–100  K).A hyperfine interaction with four nearest C neighbors similar tothat of the well-known silicon vacancy in the negative chargestate was observed, but the LE1 center has a lowersymmetry, C2v. Supercell calculations of different configurations of silicon vacancy-interstitialFrenkel-pairs, VSi-Sii, were performed showing that pairs with a nearestneighbor Si interstitial are unstable—VSi and Sii will automatically recombine—whereaspairs with a second neighbor Sii are stable. Comparing thedata obtained from EPR and supercell calculations, the LE1 centeris assigned to the Frenkel-pair between VSi and a secondneighbor Sii interstitial along the [100] direction in the 3+charge state, V-Si. In addition, a path for the migrationof Si was found in 3C SiC. In samples irradiatedat low temperatures, the LE1 Frenkel-pair was found to bethe dominating defect whereas EPR signals of single vacancies werenot detected. The center disappears after warming up the samplesto room temperature.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

electron beam effects
Frenkel defects
hyperfine interactions
interstitials
paramagnetic resonance
silicon compounds
wide band gap semiconductors
Semiconductor physics
Halvledarfysik

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ref (subject category)
art (subject category)

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