Tuning the Photoluminescence and Raman Response of Single-Layer WS2 Crystals Using Biaxial Strain

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F23%3A00569161" target="_blank" >RIV/61388955:_____/23:00569161 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0340496" target="_blank" >https://hdl.handle.net/11104/0340496</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.2c06933" target="_blank" >10.1021/acs.jpcc.2c06933</a>

Result language

angličtina

Original language name

Tuning the Photoluminescence and Raman Response of Single-Layer WS2 Crystals Using Biaxial Strain

Original language description

Chemical vapor deposited WS2 monolayers are subjected for the first time to controlled pure biaxial tensile strain up to 0.7%. From photoluminescence (PL) spectroscopy, the trion and neutral exciton deformation potentials are found to be similar, approximately −130 meV/%. It is shown that the excess carrier concentration as well as residual strain in WS2 samples can be determined from the PL spectra. The experimental Grüneisen parameter of the in-plane E′ Raman mode for 1L-WS2 is found to be equal to the corresponding mode (E2g) mode in bulk WS2. The impact of mechanical strain on the electronic and phonon band structures is also calculated in the framework of density functional theory. The theoretically obtained deformation potential for the direct transition is in very good agreement with the experiment. The reduced dimensionality of the monolayer enables the visualization over the entire Brillouin zone of both the calculated phonon dispersions and the Grüneisen parameters, which are compared with the experimentally accessible ones. This work contributes to the experimental implementation of mechanical strain engineering applications in semiconducting two-dimensional transition metal dichalcogenides.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

1932-7455

Volume of the periodical

127

Issue of the periodical within the volume

7

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

3506-3515

UT code for WoS article

000956163900001

EID of the result in the Scopus database

2-s2.0-85148296430