Effect of faceting on the band gap of ordered GaInP

Journal Article · Mon Aug 15 04:00:00 EDT 1994 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.112188· OSTI ID:7166579

Friedman, D J; Horner, G S; Kurtz, S R; Bertness, K A; Olson, J M ^[1]; Moreland, J ^[2]

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1. National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, Colorado 80401 (United States)
2. National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80303 (United States)

It has been shown that under certain growth conditions the pseudobinary semiconductor alloy GaInP shows cation site ordering into the Cu-Pt structure, and that this ordering results in a lowering of the band gap [ital E][sub [ital g]] from that of the disordered alloy. The [ital E][sub [ital g]] lowering is known to depend on growth conditions, including the orientation of the substrate. We study the dependence of [ital E][sub [ital g]] on epilayer thickness for GaInP grown by metal-organic vapor-phase epitaxy. For epilayers grown on singular (100) substrates under growth conditions conventionally used to produce ordered material, [ital E][sub [ital g]] decreases dramatically with increasing epilayer thickness: [ital E][sub [ital g]] for a 10-[mu]m-thick epilayer is [similar to]40 meV lower than for a 1-[mu]m-thick epilayer. This dependence of [ital E][sub [ital g]] on thickness can be understood in terms of the recently observed faceting of the GaInP growth surface.

• DOE Contract Number: AC36-83CH10093
• OSTI ID: 7166579
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 65:7; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360606* -- Other Materials-- Physical Properties-- (1992-)
CRYSTAL STRUCTURE
ELECTRONIC STRUCTURE
ENERGY GAP
EPITAXY
FILMS
GALLIUM COMPOUNDS
GALLIUM PHOSPHIDES
INDIUM COMPOUNDS
INDIUM PHOSPHIDES
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PNICTIDES
THIN FILMS