(111) oriented (GaAs)/sub n/(AlAs)/sub n/ superlattices are direct band-gap materials for all n's
Journal Article
·
· Appl. Phys. Lett.; (United States)
Total energy calculations show that the (111) (AlAs)/sub n/(GaAs)/sub n/ superlattice has a lower formation enthalpy (i.e., is stabler) than either the (001) or (110) superlattices. Self-consistent band structure calculations further show that while the (001) superlattice is direct only for n>7, the (111) superlattice has (i) a smaller and (ii) a direct (not pseudodirect) gap for all n's. Contrary to the expectations based on particle in a box models, the confined states at the zone center are strongly localized even for the monolayer superlattice.
- Research Organization:
- Solar Energy Research Institute, Golden, Colorado 80401
- OSTI ID:
- 7014797
- Journal Information:
- Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 53:21; ISSN APPLA
- Country of Publication:
- United States
- Language:
- English
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