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Träfflista för sökning "L773:0950 0839 OR L773:1362 3036 srt2:(1995-1999)"

Sökning: L773:0950 0839 OR L773:1362 3036 > (1995-1999)

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1.
  • Gutiérrez, R., et al. (författare)
  • The formation of nanopipes caused by donor impurities in GaN: A theoretical study for the case of oxygen
  • 1999
  • Ingår i: Philosophical Magazine Letters. - : Informa UK Limited. - 0950-0839 .- 1362-3036. ; 79:3, s. 147-152
  • Tidskriftsartikel (refereegranskat)abstract
    • Local density-functional methods are used to examine the behaviour of O and O-related defect complexes at {1010}-type surfaces in GaN. We find that O has a tendency to segregate to the (1010) surface and we identify the gallium vacancy surrounded by three oxygen impurities (VGa-(ON)3) to be a particularly stable and electrically inert complex. We suggest that these complexes impede growth at the walls of the nanopipes preventing them from growing in. Also, other donor-related defect complexes, in particular gallium vacancies surrounded by three silicon atoms as second nearest neighbours, are expected to have the same effect.
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2.
  • Sagalowicz, Laurent, et al. (författare)
  • Structure of the wafer fused InP (001)-GaAs (001) interface
  • 1997
  • Ingår i: Philosophical Magazine Letters. - : Informa UK Limited. - 0950-0839 .- 1362-3036. ; 76:6, s. 445-452
  • Tidskriftsartikel (refereegranskat)abstract
    • A structural study of wafer fused InP-GaAs interfaces has been carried out. The geometry of the dislocation network which accommodates the twist and the lattice mismatch is first given using a geometrical approach. Cross-sectional transmission electron microscopy and plan view observations are presented. Two different misfit cases are observed. (1) When no twist is present, the 3.7% lattice mismatch is relaxed by a regular square network of dislocations with pure edge character. (2) When an additional twist is present, a square network of dislocations results as well but here the dislocations have a mixed character; 60° dislocations are also observed, some form closed defect circuits and others very likely accommodate a small tilt. The interaction between the 60° dislocations and the edge dislocations is explained in detail. Voids or inclusions are also observed as well as additional dislocations which may accommodate part of the thermal mismatch. © 1997 Taylor & Francis Ltd.
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