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

P. T. Webster, A. J. Shalindar, N. A. Riordan, C. Gogineni, H. Liang, A. R. Sharma, Shane Johnson

Research output: Contribution to journalArticle

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Abstract

The optical properties of bulk InAs0.936Bi0.064 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 InAs0.936Bi0.064 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/InAs0.911Sb0.089 and GaSb/InAs0.932Bi0.068 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.

Original languageEnglish (US)
Article number225701
JournalJournal of Applied Physics
Volume119
Issue number22
DOIs
StatePublished - Jun 14 2016

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superlattices
optical properties
ellipsometry
absorptivity
molecular beam epitaxy
software development tools
energy
refraction
valence
photoluminescence
impurities
detectors
photons
room temperature
coefficients
wavelengths
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Optical properties of InAsBi and optimal designs of lattice-matched and strain-balanced III-V semiconductor superlattices. / Webster, P. T.; Shalindar, A. J.; Riordan, N. A.; Gogineni, C.; Liang, H.; Sharma, A. R.; Johnson, Shane.

In: Journal of Applied Physics, Vol. 119, No. 22, 225701, 14.06.2016.

Research output: Contribution to journalArticle

Webster, P. T. ; Shalindar, A. J. ; Riordan, N. A. ; Gogineni, C. ; Liang, H. ; Sharma, A. R. ; Johnson, Shane. / Optical properties of InAsBi and optimal designs of lattice-matched and strain-balanced III-V semiconductor superlattices. In: Journal of Applied Physics. 2016 ; Vol. 119, No. 22.
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