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TEM study of compositional modulations in a GaInAsSb film grown on GaSb vicinal substrates

: Konidaris, S.; Szczeszek, P.; Polychroniadis, E.K.; Dimroth, F.


Cetin, S. A. ; Balkan Physical Union -BPU-:
Sixth international conference of the Balkan Physical Union. Proceedings CD-ROM : Istanbul, Turkey, 22 - 26 August 2006
Melville, NY: AIP, 2007 (AIP Conference Proceedings 899)
ISBN: 978-0-7354-0404-5
ISSN: 0094-243X
Balkan Physical Union (International Conference) <6, 2006, Istanbul>
Fraunhofer ISE ()

Quaternary semiconductor alloys based on GaSb are suitable for thermophotovoltaic (TPV) cell applications as they have low and adjustable band-gap. However, they exhibit phase separation which destroys band-gap uniformity. In this work, GaInAsSb thin films grown on GaSb vicinal substrates with different miscut angles were studied by CTEM, in order to determine the influence of the cut-off angle on phase separation. It was found that the coatings exhibit two types of compositional modulation (CM), one parallel (Vertical CM - VCM) and the other forming an angle (Lateral CM - LCM) with the substrate plane. The VCM does not depend on the cut-off angle while the LCM does.