Optical properties of InAsBi and optimal designs of lattice-matched and strain-balanced III-V semiconductor superlattices

Journal Article · Tue Jun 14 04:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4953027· OSTI ID:22596801

Riordan, N. A.; Gogineni, C.; Liang, H.; Sharma, A. R.; Johnson, S. R. ^[1]; Shalindar, A. J. ^[2]

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1. Center for Photonics Innovation and School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287 (United States)
2. Center for Photonics Innovation and School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona 85287 (United States)

The optical properties of bulk InAs{sub 0.936}Bi{sub 0.064} grown by molecular beam epitaxy on a (100)-oriented GaSb substrate are measured using spectroscopic ellipsometry. The index of refraction and absorption coefficient are measured over photon energies ranging from 44 meV to 4.4 eV and are used to identify the room temperature bandgap energy of bulk InAs{sub 0.936}Bi{sub 0.064} as 60.6 meV. The bandgap of InAsBi is expressed as a function of Bi mole fraction using the band anticrossing model and a characteristic coupling strength of 1.529 eV between the Bi impurity state and the InAs valence band. These results are programmed into a software tool that calculates the miniband structure of semiconductor superlattices and identifies optimal designs in terms of maximizing the electron-hole wavefunction overlap as a function of transition energy. These functionalities are demonstrated by mapping the design spaces of lattice-matched GaSb/InAs{sub 0.911}Sb{sub 0.089} and GaSb/InAs{sub 0.932}Bi{sub 0.068} and strain-balanced InAs/InAsSb, InAs/GaInSb, and InAs/InAsBi superlattices on GaSb. The absorption properties of each of these material systems are directly compared by relating the wavefunction overlap square to the absorption coefficient of each optimized design. Optimal design criteria are provided for key detector wavelengths for each superlattice system. The optimal design mid-wave infrared InAs/InAsSb superlattice is grown using molecular beam epitaxy, and its optical properties are evaluated using spectroscopic ellipsometry and photoluminescence spectroscopy.

• OSTI ID: 22596801
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 22 Vol. 119; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BALANCES
BISMUTH COMPOUNDS
COMPARATIVE EVALUATIONS
COMPUTER CODES
ELECTRONS
ELLIPSOMETRY
GALLIUM ANTIMONIDES
HOLES
IMPURITIES
INDIUM ARSENIDES
MOLECULAR BEAM EPITAXY
MOLECULAR BEAMS
PHOTOLUMINESCENCE
PHOTONS
REFRACTIVE INDEX
SEMICONDUCTOR MATERIALS
STRAINS
SUPERLATTICES
TEMPERATURE RANGE 0273-0400 K
WAVE FUNCTIONS