Orientational superlattices formed by CuPt-ordered zinc-blende semiconductor alloys
- National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)
We performed a systematic study on a nonconventional semiconductor heterostructure{emdash}{ital orientational superlattices} (OSL{close_quote}s){emdash}based on CuPt-ordered zinc-blende alloys. Instead of the band offset in conventional superlattices, it is the discontinuity in the angular momentum which brings about the superlattice effects in orientational superlattices. Valence-band structures of five polytypes of OSL{close_quote}s formed by CuPt-ordered GaInP{sub 2} layers have been classified according to their symmetries and calculated numerically by using the envelope-function approximation for structures with different periods, ratios of layer thickness, and degree of order. On one hand, features similar to those in conventional superlattices{emdash}wave-function modulation, band-gap modification, and the formation of subbands and minigaps{emdash}can be achieved purely from an orientational alternation of the semiconductor layers. On the other hand, the dependence of energy levels on layer thickness and the wave-function distributions in OSL{close_quote}s are distinct from that in conventional superlattices. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- DOE Contract Number:
- AC36-83CH10093
- OSTI ID:
- 503703
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 19; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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