Unraveling electronic band structure of narrow-bandgap p-n nanojunctions in heterostructured nanowires
(2021) In Physical Chemistry Chemical Physics 23(44). p.25019-25023- Abstract
The electronic band structure of complex nanostructured semiconductors has a considerable effect on the final electronic and optical properties of the material and, ultimately, on the functionality of the devices incorporating them. Valence electron energy-loss spectroscopy (VEELS) in the transmission electron microscope (TEM) provides the possibility of measuring this property of semiconductors with high spatial resolution. However, it still represents a challenge for narrow-bandgap semiconductors, since an electron beam with low energy spread is required. Here we demonstrate that by means of monochromated VEELS we can study the electronic band structure of narrow-gap materials GaSb and InAs in the form of heterostructured nanowires,... (More)
The electronic band structure of complex nanostructured semiconductors has a considerable effect on the final electronic and optical properties of the material and, ultimately, on the functionality of the devices incorporating them. Valence electron energy-loss spectroscopy (VEELS) in the transmission electron microscope (TEM) provides the possibility of measuring this property of semiconductors with high spatial resolution. However, it still represents a challenge for narrow-bandgap semiconductors, since an electron beam with low energy spread is required. Here we demonstrate that by means of monochromated VEELS we can study the electronic band structure of narrow-gap materials GaSb and InAs in the form of heterostructured nanowires, with bandgap values down to 0.5 eV, especially important for newly developed structures with unknown bandgaps. Using complex heterostructured InAs-GaSb nanowires, we determine a bandgap value of 0.54 eV for wurtzite InAs. Moreover, we directly compare the bandgaps of wurtzite and zinc blende polytypes of GaSb in a single nanostructure, measured here as 0.84 and 0.75 eV, respectively. This allows us to solve an existing controversy in the band alignment between these structures arising from theoretical predictions. The findings demonstrate the potential of monochromated VEELS to provide a better understanding of the band alignment at the heterointerfaces of narrow-bandgap complex nanostructured materials with high spatial resolution. This is especially important for semiconductor device applications where even the slightest variations of the electronic band structure at the nanoscale can play a crucial role in their functionality.
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- author
- Zamani, Reza R. LU ; Hage, Fredrik S. ; Eljarrat, Alberto ; Namazi, Luna LU ; Ramasse, Quentin M. and Dick, Kimberly A. LU
- organization
- publishing date
- 2021-11-28
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Chemistry Chemical Physics
- volume
- 23
- issue
- 44
- pages
- 5 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- scopus:85119719130
- pmid:34730587
- ISSN
- 1463-9076
- DOI
- 10.1039/d1cp03275e
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © the Owner Societies.
- id
- d73e059c-f413-46e6-af6b-0f72e66b4053
- date added to LUP
- 2022-02-11 14:44:36
- date last changed
- 2024-07-03 02:03:18
@article{d73e059c-f413-46e6-af6b-0f72e66b4053,
abstract = {{<p>The electronic band structure of complex nanostructured semiconductors has a considerable effect on the final electronic and optical properties of the material and, ultimately, on the functionality of the devices incorporating them. Valence electron energy-loss spectroscopy (VEELS) in the transmission electron microscope (TEM) provides the possibility of measuring this property of semiconductors with high spatial resolution. However, it still represents a challenge for narrow-bandgap semiconductors, since an electron beam with low energy spread is required. Here we demonstrate that by means of monochromated VEELS we can study the electronic band structure of narrow-gap materials GaSb and InAs in the form of heterostructured nanowires, with bandgap values down to 0.5 eV, especially important for newly developed structures with unknown bandgaps. Using complex heterostructured InAs-GaSb nanowires, we determine a bandgap value of 0.54 eV for wurtzite InAs. Moreover, we directly compare the bandgaps of wurtzite and zinc blende polytypes of GaSb in a single nanostructure, measured here as 0.84 and 0.75 eV, respectively. This allows us to solve an existing controversy in the band alignment between these structures arising from theoretical predictions. The findings demonstrate the potential of monochromated VEELS to provide a better understanding of the band alignment at the heterointerfaces of narrow-bandgap complex nanostructured materials with high spatial resolution. This is especially important for semiconductor device applications where even the slightest variations of the electronic band structure at the nanoscale can play a crucial role in their functionality.</p>}},
author = {{Zamani, Reza R. and Hage, Fredrik S. and Eljarrat, Alberto and Namazi, Luna and Ramasse, Quentin M. and Dick, Kimberly A.}},
issn = {{1463-9076}},
language = {{eng}},
month = {{11}},
number = {{44}},
pages = {{25019--25023}},
publisher = {{Royal Society of Chemistry}},
series = {{Physical Chemistry Chemical Physics}},
title = {{Unraveling electronic band structure of narrow-bandgap p-n nanojunctions in heterostructured nanowires}},
url = {{http://dx.doi.org/10.1039/d1cp03275e}},
doi = {{10.1039/d1cp03275e}},
volume = {{23}},
year = {{2021}},
}