Lattice mismatch and band offsets in strained layers
- 15 October 1986
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 60 (8), 2893-2896
- https://doi.org/10.1063/1.337780
Abstract
Lattice mismatch effects are obscured by the standard envelope wave‐function approach to electronic states because the lattice potential does not appear. A theoretical analysis of the first‐order effect of lattice mismatch is presented using the deformable ion approximation. It is found that a potential barrier of height Δ, normally associated with a band offset, acquires an additional energy (E) dependent term becoming Δ+η(Δ−E) where η is the fractional lattice mismatch in the growth direction. For strained layers, Δ includes the effect of deformation in the strained layer. Quantitatively, the lattice mismatch effect can be comparable to or larger than the deformation potential effect on the band offset. A scattering approach is employed.Keywords
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