TITLE

Negative band gap bowing in epitaxial InAs/GaAs alloys and predicted band offsets of the strained binaries and alloys on various substrates

AUTHOR(S)
Kim, Kwiseon; Hart, Gus L. W.; Zunger, Alex
PUB. DATE
April 2002
SOURCE
Applied Physics Letters;4/29/2002, Vol. 80 Issue 17, p3105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We use pseudopotential theory to provide (1) the band offsets of strained GaAs and InAs on various substrates and (2) the energies E[sub v](x) and E[sub c](x) of the valence and conduction bands of In[sub x]Ga[sub 1-x]As alloy, as a function of composition. Results are presented for both the bulk alloy and for the alloy strained on InP or GaAs. We predict that while E[sub c](x) bows downward for relaxed bulk alloys, it bows upward for strained epitaxial alloys. The calculated alloy offsets are used to discuss electron and hole localization in this system. © 2002 American Institute of Physics.
ACCESSION #
6540282

 

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