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Spontaneous Lateral Composition Modulation in III-V Semiconductor Alloys

Published online by Cambridge University Press:  29 November 2013

J. Mirecki Millunchick ,
R.D. Twesten ,
S.R. Lee ,
D.M. Follstaedt ,
E.D. Jones ,
S.P. Ahrenkiel ,
Y. Zhang ,
H.M. Cheong  and
A. Mascarenhas
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Extract

The application of III-V semiconductor alloys in device structures is of importance for high-speed microelectronics and optoelectronics. These alloys have allowed the device engineer to tailor material parameters such as the bandgap and carrier mobility to the need of the device by altering the alloy composition. When using ternary or quaternary materials, the device designer presumes that the alloy is completely disordered, without any correlation between the atoms on the cation (anion) sublattice. However the thermodynamics of the alloy system often produce material that has some degree of macroscopic or microscopic ordering. Short-range ordering occurs when atoms adopt correlated neighboring positions over distances of the order of a few lattice spacings. This can be manifested as the preferential association of like atoms, as in clustering, or of unlike atoms, as in chemical ordering (e.g., CuPt ordering). Long-range ordering occurs over many tens of lattice spacings, as in the case of phase separation. In either short-range or long-range ordering, the band structure and the crystal symmetry are greatly altered. Therefore it is absolutely critical that the mechanisms be fully understood to prevent ordering when necessary or to exploit it when possible.

Type
Compositional Modulation and Ordering in Semiconductors
Information
MRS Bulletin , Volume 22 , Issue 7 , July 1997 , pp. 38 - 43
Copyright
Copyright © Materials Research Society 1997

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