Strain-induced photoreflectance spectra in the vicinity of the E
0 transition in GaAs/Si and InP/Si heterostructures |
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Authors: | R V Kuz’menko A V Ganzha O V Bochurova É P Domashevskaya J Schreiber S Hildebrandt S Mo E Peiner |
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Institution: | 1. Voronezh State University, 394693, Voronezh, Russia 2. Fachbereich Physik der Martin-Luther-Universit?t Halle-Wittenberg, D-06108, Halle/Saale, Deutschland 3. Institut für Halbleitertechnik der Technischen Universit?t Braunschweig, D-38106, Braunschweig, Deutschland
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Abstract: | A study is reported of the structure of photoreflectance (PR) spectra in the vicinity of the E
0 transition from thin (d=1–5 μm) n-GaAs and n-InP films (n=1016–1017 cm−3) grown epitaxially on Si(001) substrates. A quantitative analysis of the spectra involving multi-component fitting shows
that the electronic optical transition from the {3/2;±1/2} subband provides a dominant contribution to the intermediate-field
electromodulation component in both systems. The splitting observed in the GaAS/Si PR spectra near the main peak are accounted
for not by the strain-induced valence-band splitting but rather by a spectral superposition of the intermediate-field component
due to the {3/2;±1/2} subband with a low-energy excitonic component. The analytically established transition energy E
0
3/2;±1/2
is used to calculate biaxial strains in epitaxial films.
Fiz. Tverd. Tela (St. Petersburg) 41, 725–731 (April 1999) |
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