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Proceedings Paper

Reflectance-difference spectroscopy: a technique for characterization of dislocations in semiconductors
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Paper Abstract

We report on the application of reflectance-difference (RD) spectroscopy to the characterization of 60 degree dislocations in zincblend semiconductors. We discuss a physical model based on dislocation induced anisotropic strains which predict a RD lineshape proportional to the first energy derivative of the semiconductor reflectance spectrum. We present RD spectra for semi-insulating GaAs:Cr (100) crystals in the 1.2 - 3.5 eV energy range, which show a first derivative component in accordance to our model. From a fitting of the experimental RD spectra to the theoretical lineshape we obtain average values for the strains associated to 60 degree dislocations. We also show that for the samples reported in this paper the dislocation-induced anisotropic strain results in a normalized effective change in lattice constant in the range from 10-5 to 10-4.

Paper Details

Date Published: 1 May 1996
PDF: 11 pages
Proc. SPIE 2693, Physics and Simulation of Optoelectronic Devices IV, (1 May 1996); doi: 10.1117/12.239015
Show Author Affiliations
Luis Felipe Lastras-Martinez, Univ. Autonoma de San Luis Potosi (Mexico)
Alfonso Lastras-Martinez, Univ. Autonoma de San Luis Potosi (Mexico)


Published in SPIE Proceedings Vol. 2693:
Physics and Simulation of Optoelectronic Devices IV
Weng W. Chow; Marek Osinski, Editor(s)

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