Exploring the band structure of Wurtzite InAs nanowires using photocurrent spectroscopy

We use polarized photocurrent spectroscopy in a nanowire device to investigate the band structure of hexagonal Wurtzite InAs. Signatures of optical transitions between four valence bands and two conduction bands are observed which are consistent with the symmetries expected from group theory. The gr...

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Bibliographic Details
Published in:Nano research 2020-06, Vol.13 (6), p.1586-1591
Main Authors: Pournia, Seyyedesadaf, Linser, Samuel, Jnawali, Giriraj, Jackson, Howard E., Smith, Leigh M., Ameruddin, Amira, Caroff, Philippe, Wong-Leung, Jennifer, Tan, Hark Hoe, Jagadish, Chennupati, Joyce, Hannah J.
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Band structure of solids
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Conduction
Conduction bands
Group III-V semiconductors
Group theory
Indium arsenides
Materials Science
Nanotechnology
Nanowires
Photoelectric effect
Photoelectric emission
Photoluminescence
Photons
Research Article
Spectral emittance
Spectroscopy
Spectrum analysis
Substrates
Valence band
Wurtzite
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Summary:We use polarized photocurrent spectroscopy in a nanowire device to investigate the band structure of hexagonal Wurtzite InAs. Signatures of optical transitions between four valence bands and two conduction bands are observed which are consistent with the symmetries expected from group theory. The ground state transition energy identified from photocurrent spectra is seen to be consistent with photoluminescence emitted from a cluster of nanowires from the same growth substrate. From the energies of the observed bands we determine the spin orbit and crystal field energies in Wurtzite InAs. This information is vital to the development of crystal phase engineering of this important III-V semiconductor.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-2774-0