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Theory of Surface Dimerization-induced Ordering in GaInP Alloys

Published online by Cambridge University Press:  10 February 2011

S. B. Zhang ,
Sverre Froyen  and
Alex Zunger
S. B. Zhang
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
Sverre Froyen
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
Alex Zunger
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
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Abstract

We identify via thermodynamic energy minimization the role of subsurface strain (caused by surface reconstruction and dimerization) in the ordering of Ga0.51n0.5P alloys. Depending on the growth conditions, the alloy surfaces can have either β2(2×4), c(4×4) or c(8×6) reconstructions, with characteristic 2×1, 1×2 and 2×3 RHEED patterns. We show that (i) the 1×2 reconstruction will lead to a CUPtA surface ordering, (ii) a 2×1 reconstruction will lead to a CuPtB ordering, (iii) a 2×3 reconstruction will lead to a 3-period ordering, and (iv) single (double) bilayer steps are stable at low (high) anion chemical potential. These results are in good agreement with recent experimental observations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 417: Symposium EE – Optoelectronic Materials-Ordering, Composition Modulation, and Self-Assembled … , 1995 , 43
Copyright
Copyright © Materials Research Society 1996

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