Critical thickness of atomically ordered III-V alloys

France, Ryan M.; McMahon, William E.; Guthrey, Harvey L.

doi:10.1063/1.4933092

Title: Critical thickness of atomically ordered III-V alloys

Journal Article · Mon Oct 12 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4933092· OSTI ID:1225924

France, Ryan M. ^[1]; McMahon, William E. ^[1]; Guthrey, Harvey L. ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)

The critical thickness model is modified with a general boundary energy that describes the change in bulk energy as a dislocation regularly alters the atomic structure of an ordered material. The model is evaluated for dislocations gliding through CuPt-ordered GaInP and GaInAs, where the boundary energy is negative and the boundary is stable. With ordering present, the critical thickness is significantly lowered and remains finite as the mismatch strain approaches zero. The reduction in critical thickness is most significant when the order parameter is greatest and the amount of misfit energy is low. The modified model is experimentally validated for low-misfit GaInP epilayers with varying order parameters using in situ wafer curvature and ex situ cathodoluminescence. With strong ordering, relaxation begins at a lower thickness and occurs at a greater rate, which is consistent with a lower critical thickness and increased glide force. Furthermore, atomic ordering is an important consideration for the stability of lattice-mismatched devices.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1225924

Alternate ID(s):: OSTI ID: 1420524

Report Number(s):: NREL/JA-5J00-64874

Journal Information:: Applied Physics Letters, Vol. 107, Issue 15; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (19)

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14 SOLAR ENERGY
36 MATERIALS SCIENCE
CuPt
GaInP
GaInAs
boundary energy
dislocation
atomic ordering
relaxation
glide force
critical thickness
luminescence
superlattices
chemical elements
crystal lattices
semiconductor detectors
Poisson's ratio
epitaxy
surface physics
mechanical stress
dimerization

Title: Critical thickness of atomically ordered III-V alloys

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