Murray, Clifford ORCID: 0000-0002-5618-0915, van Efferen, Camiel, Jolie, Wouter, Fischer, Jeison Antonio, Hall, Joshua, Rosch, Achim
ORCID: 0000-0002-6586-5721, Krasheninnikov, Arkady V., Komsa, Hannu-Pekka
ORCID: 0000-0002-0970-0957 and Michely, Thomas
(2020).
Band Bending and Valence Band Quantization at Line Defects in MoS2.
ACS Nano, 14 (7).
S. 9176 - 9188.
WASHINGTON:
AMER CHEMICAL SOC.
ISSN 1936-086X
Abstract
The variation of the electronic structure normal to 1D defects in quasi-freestanding MoS2, grown by molecular beam epitaxy, is investigated through high resolution scanning tunneling spectroscopy at 5 K. Strong upward bending of valence and conduction bands toward the line defects is found for the 4 vertical bar 4E mirror twin boundary and island edges but not for the 4 vertical bar 4P mirror twin boundary. Quantized energy levels in the valence band are observed wherever upward band bending takes place. Focusing on the common 4 vertical bar 4E mirror twin boundary, density functional theory calculations give an estimate of its charging, which agrees well with electrostatic modeling. We show that the line charge can also be assessed from the filling of the boundary-localized electronic band, whereby we provide a measurement of the theoretically predicted quantized polarization charge at MoS2 mirror twin boundaries. These calculations elucidate the origin of band bending and charging at these 1D defects in MoS2. The 4 vertical bar 4E mirror twin boundary not only impairs charge transport of electrons and holes due to band bending, but holes are additionally subject to a potential barrier, which is inferred from the independence of the quantized energy landscape on either side of the boundary.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||
Creators: |
|
||||||||||||||||||||||||||||||||||||||||
URN: | urn:nbn:de:hbz:38-325562 | ||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1021/acsnano.0c04945 | ||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | ACS Nano | ||||||||||||||||||||||||||||||||||||||||
Volume: | 14 | ||||||||||||||||||||||||||||||||||||||||
Number: | 7 | ||||||||||||||||||||||||||||||||||||||||
Page Range: | S. 9176 - 9188 | ||||||||||||||||||||||||||||||||||||||||
Date: | 2020 | ||||||||||||||||||||||||||||||||||||||||
Publisher: | AMER CHEMICAL SOC | ||||||||||||||||||||||||||||||||||||||||
Place of Publication: | WASHINGTON | ||||||||||||||||||||||||||||||||||||||||
ISSN: | 1936-086X | ||||||||||||||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||||||||||||||
Faculty: | Faculty of Mathematics and Natural Sciences | ||||||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics | ||||||||||||||||||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||||||||||||||||||
Uncontrolled Keywords: |
|
||||||||||||||||||||||||||||||||||||||||
Refereed: | Yes | ||||||||||||||||||||||||||||||||||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/32556 |
Downloads
Downloads per month over past year
Altmetric
Export
Actions (login required)
![]() |
View Item |