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Determination of arsenic diffusion parameters by sulfur indiffusion in gallium arsenide

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5 Author(s)
Scholz, R.F. ; Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany ; Werner, P. ; Gosele, U. ; Engler, N.
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Indiffusion profiles of sulfur in gallium arsenide were determined by secondary ion mass spectroscopy. In order to evaluate the shape of the profiles, a set of coupled reaction–diffusion equations was solved numerically. From the simulated nonequilibrium indiffusion profiles of sulfur, which diffuses into gallium arsenide via the kick-out mechanism, both the diffusion coefficient and the equilibrium concentration of arsenic self-interstitials were simultaneously determined. Transmission electron microscopy revealed that, due to an arsenic supersaturation, extrinsic dislocation loops have formed. The Fermi-level effect is more pronounced at lower diffusion temperatures and provides an additional driving force for the loop formation, agreeing well with the occurrence of larger faulted loops at a diffusion temperature of 950 °C rather than at 1100 °C. The complex behavior of the sulfur indiffusion can be quantitatively described by taking into account extended defects. © 2000 American Institute of Physics.

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Journal of Applied Physics  (Volume:88 ,  Issue: 12 )