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Proceedings Paper

Electroabsorption study of lattice mismatch in InGaAsP/InP heterostructures
Author(s): Gerhard Weiser; R. Weihofen; G. G. Baumann
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Paper Abstract

Low field electroabsorption spectra are compared with absorption spectra and are used to determine accurately the band gap. The spectra show for larger fields F numerous Franz-Keldysh oscillations above the absorption edge which shift in perfect agreement with theory. This shift allows determination of built-in fields and the actual field-strength in the sample. Lattice mismatch removes the valence band degeneracy and causes for fractional change of the lattice constant za/a < 0 splitting into a doublet of the electroabsorption spectrum at small fields. The splitting disappears at higher fields and is never observed for La/a > 0. This different behaviour probably results from differences of the band structure in field direction.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1286, Modulation Spectroscopy, (1 August 1990); doi: 10.1117/12.20862
Show Author Affiliations
Gerhard Weiser, Univ. of Marburg (Germany)
R. Weihofen, Univ. of Marburg (Germany)
G. G. Baumann, Siemens AG (Germany)

Published in SPIE Proceedings Vol. 1286:
Modulation Spectroscopy
Fred H. Pollak; Manuel Cardona; David E. Aspnes, Editor(s)

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