Optical properties of ordered and randomly disordered AlAs/GaAs short-period superlattices

Journal Article · Fri Apr 15 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.11173· OSTI ID:5119694

Arent, D J; Alonso, R G; Horner, G S; Levi, D; Bode, M; Mascarenhas, A; Olson, J M ^[1]; Yin, X; DeLong, M C ^[2]; SpringThorpe, A J; Majeed, A ^[3]; Mowbray, D J; Skolnick, M S ^[4]

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1. National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401 (United States)
2. Department of Physics, University of Utah, Salt Lake City, Utah 84112 (United States)
3. Bell Northern Research, Limited, P.O. Box 3511, Station C, Ottawa, Ontario, K1Y 4H7 (Canada)
4. Department of Physics, University of Sheffield, Sheffield S3 7RH (United Kingdom)

The optical properties of different atomic arrangements of Al[sub 0.5]Ga[sub 0.5]As, deposited by molecular-beam epitaxy and having nominally identical average composition, have been compared. Markedly different signatures are seen in steady-state, time-resolved, and microwave-modulated photoluminescence, photoreflectance, and photoluminescence-excitation spectroscopies for a random pseudobinary alloy and (AlAs)[sub [ital n]](GaAs)[sub 4[minus][ital n]] superlattices where [ital n]=2 (ordered) or [ital n] is randomly chosen (disordered) from the sets [1,2,3] or [0,1,2,3,4]. When [ital n]=[0, 1, 2, 3, or 4] the optical properties are dominated by quantum confinement effects due to the presence of layers with thicknesses up to 14 monolayers. When [ital n]=[1, 2, or 3] the optical properties are consistently described by the presence of disorder-induced localized states and a hopping-assisted recombination mechanism.

• DOE Contract Number: AC02-83CH10093
• OSTI ID: 5119694
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:16; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360606* -- Other Materials-- Physical Properties-- (1992-)
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
CONFINEMENT
ELECTRONIC STRUCTURE
EPITAXY
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
LUMINESCENCE
MICROSTRUCTURE
MOLECULAR BEAM EPITAXY
OPTICAL PROPERTIES
PHOTOLUMINESCENCE
PHYSICAL PROPERTIES
PNICTIDES
RECOMBINATION
SUPERLATTICES