Temperature dependent lattice constant of Al0.90Ga0.10AsySb1-y

Author
Breivik, Magnus
Nilsen, Tron Arne
Myrvågnes, Geir
Selvig, Espen
Fimland, Bjørn-Ove
Date Issued
2010
Permalink
http://hdl.handle.net/20.500.12242/433
http://publications.ffi.no/handle/123456789/433
DOI
10.1116/1.3414830
Collection
Articles
Description
Breivik, Magnus; Nilsen, Tron Arne; Myrvågnes, Geir; Selvig, Espen; Fimland, Bjørn-Ove. Temperature dependent lattice constant of Al0.90Ga0.10AsySb1-y. Journal of Vacuum Science & Technology B 2010 ;Volum 28.(3) s. C3I1-C3I5
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Abstract
Using x-ray diffraction, the in-plane and out-of-plane lattice constants of Al0.90Ga0.10AsySb1−y epilayers grown on GaSb and GaAs substrates were determined between 30 and 398 °C for y = 0.003–0.059. The bulk lattice constant was then calculated from the in-plane and out-of-plane lattice constants. A polynomial function for the bulk lattice constant as a function of y and temperature was derived from a fit to the resulting data. Comparison to measured out-of-plane lattice constants of platinum-coated Al0.90Ga0.10AsySb1−y indicates that the polynomial function is valid up to around 550 °C. The polynomial function can be used to determine the lattice matching of Al0.90Ga0.10AsySb1−y to, e.g., GaSb at typical growth temperatures used for growth of cladding layers in laser structures. A formula is given for calculating the As mole fraction for lattice matching to GaSb at a given temperature.
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