Photomodulated transmittance of GaBiAs layers grown on (0 0 1) and (3 1 1)B GaAs substrates

Kudrawiec, R. and Poloczek, P. and Misiewicz, J. and Shafi, M. and Ibáñez, J. and Mari, R. H. and Henini, M. and Schmidbauer, M. and Novikov, S. V. and Turyanska, L. and Molina, S. I. and Sales, D. L. and Chisholm, M. F. (2009) Photomodulated transmittance of GaBiAs layers grown on (0 0 1) and (3 1 1)B GaAs substrates. Microelectronics Journal, 40 (3). pp. 537-539. ISSN 0026-2692

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Abstract

In this work, photomodulated transmittance (PT) has been applied to investigate the energy gap of GaBiAs layers grown on (0 0 1) and (3 1 1)B GaAs substrates. In PT spectra, a clear resonance has been observed below the GaAs edge. This resonance has been attributed to the energy gap-related absorption in GaBiAs. The energy and broadening of PT resonances have been determined using a standard approach in electromodulation spectroscopy. It has been found that the crystallographic orientation of GaAs substrate influences on the incorporation of Bi atoms into GaAs and quality of GaBiAs layers. The Bi-related energy gap reduction has been determined to be �90 meV per percent of Bi. In addition to PT spectra, common transmittance spectra have been measured and the energy gap of GaBiAs has been determined from the square of the absorption coefficient α2 around the band-gap edge. It has been found that the tail of density of states is significant for GaBiAs and influences the accuracy of energy gap determination from the α2 plot. In the case of PT spectra, the energy gap is determined unambiguously since this technique is directly sensitive to singularities in the density of states. © 2008.

Keywords:Absorption, Energy gap, Phototransistors, Resonance, Semiconducting gallium, Solids, Substrates, Absorption coefficients, Band-gap edges, Crystallographic orientations, Density of state, Electromodulation, GaAs, GaAs substrates, GaBiAs, Photomodulated transmittance, Transmittance spectrum, Gallium alloys
Subjects:F Physical Sciences > F300 Physics
Divisions:College of Science > School of Chemistry
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ID Code:22577
Deposited On:07 Apr 2016 17:39

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