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Träfflista för sökning "WFRF:(Bach M) srt2:(1995-1999)"

Sökning: WFRF:(Bach M) > (1995-1999)

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1.
  • Budde, M., et al. (författare)
  • The hydrogen-saturated self-interstitial in silicon and germanium
  • 1997
  • Ingår i: Defects in semiconductors. - : Trans Tech Publications Inc.. ; , s. 35-40
  • Konferensbidrag (refereegranskat)abstract
    • Infrared absorption spectroscopy is used to study H-related point defects in H+-implanted Si (Si:H) and Ge (Ge:H). The absorption lines at 743.1, 748.0, 1986.5 and 1989.4 cm-1 in Si:H and at 700.3, 705.5, 1881.8 and 1883.5 cm-1 in Ge:H are shown to originate from the same defect containing two equivalent H atoms. Uniaxial stress experiments show that the defects have monoclinic-II symmetry, and the orientations of the two Si-H or Ge-H bonds are determined. The structure and the local vibrational modes of the self-interstitial binding two H atoms (IH2) are calculated with LDF cluster theory. The symmetry, bond-orientations and isotopic frequency-shifts calculated for IH2 are in excellent agreement with those observed for the 743.1-, 748.0-, 1986.5- and 1989.4-cm-1 modes in Si:H and for the 700.3-, 705.5-, 1881.8- and 1883.5-cm-1 modes in Ge:H.
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3.
  • Nielsen, B. Bach, et al. (författare)
  • Local vibrational modes of weakly bound O-H complexes in SI
  • 1997
  • Ingår i: Defects in semiconductors. - : Trans Tech Publications Inc.. ; , s. 391-398
  • Konferensbidrag (refereegranskat)abstract
    • Local vibrational modes of two oxygen-hydrogen complexes have been identified with infrared absorption spectroscopy. Samples of intrinsic silicon and samples doped with 16O or 18O isotopes were implanted with protons and deuterons at ∼20 K. After the implantation, infrared absorbance spectra were measured at 8 K on unannealed samples. An oxygen mode at 1077 cm-1 and a hydrogen mode at 1879 cm-1, which originate from the same defect OHI were observed in the as-implanted samples. Heat-treatment at 200 K produced a new center OHII with modes at 1028 and 1830 cm-1. OHI anneals out at ∼130 K while OHII is stable up to ∼240 K. OHI and OHII are tentatively identified with two complexes of interstitial oxygen and bond-centred hydrogen. Ab initio theory was applied to calculate the structure and local modes of three such complexes. The results qualitatively support our tentative assignments.
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