Optical properties of GaP/GaAs/sub x/P/sub 1-x/ strained-layer superlattices
Using optical absorption, photocurrent spectroscopy, and photoluminescence, MOCVD-grown strained-layer superlattices composed of thin (100-300 A) alternating layers of lattice-mismatched (up to a few percent) GaP and to GaAs/sub x/P/sub 1-x/ with x =0.44 and 0.26 are studied. For x < 0.5 these structures are expected to exhibit direct transitions due to zone folding, even though the individual layer materials both have indirect gaps. The observed energies and strengths of the SLS optical transitions are consistent with the zone center band structure predicted for these particular samples, although the absorption strength near the band edge is weakened due to spatial separation of electrons and holes.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6795059
- Report Number(s):
- SAND-82-1297C; CONF-820960-4; ON: DE83000316
- Country of Publication:
- United States
- Language:
- English
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