Room Temperature Micro-Photoluminescence Studies of Colloidal WS₂Nanosheets

authored by

André Philipp Frauendorf, André Niebur, Lena Harms, Shivangi Shree, Bernhard Urbaszek, Michael Oestreich, Jens Hübner, Jannika Lauth

Abstract

Wet-chemical syntheses of quasi two-dimensional (2D) transition metal dichalcogenides (TMDs) have emerged as promising methods for straightforward solution-processing of these materials. However, the photoluminescence (PL) properties of colloidal TMDs are virtually unexplored due to the typically nonemitting synthesis products. In this work, we demonstrate room temperature micro-PL of delicate ultrathin colloidal WS₂nanosheets synthesized from WCl₆and elemental sulfur in oleic acid and oleylamine at 320 °C for the first time. Both mono- and multilayer PL are observed, revealing comparable characteristics to exfoliated TMD monolayers and underpinning the high quality of colloidal WS₂nanosheets. In addition, promising long-term air stability of colloidal WS₂nanosheets is found, and the control of photodegradation of the structures under laser excitation is identified as a challenge for further advancing the nanosheet monolayers. Our results render colloidal TMDs as easily synthesized and highly promising 2D semiconductors with optical properties fully competitive with conventionally fabricated ultrathin TMDs.

Organisation(s)

Institute of Solid State Physics
Institute of Physical Chemistry and Electrochemistry
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
Laboratory of Nano and Quantum Engineering
QuantumFrontiers

External Organisation(s)

Carl von Ossietzky University of Oldenburg
Universite Toulouse III - Paul Sabatier (UT3)

Type

Article

Journal

Journal of Physical Chemistry C

Volume

125

Pages

18841-18848

No. of pages

8

ISSN

1932-7447

Publication date

02.09.2021

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, Energy(all), Physical and Theoretical Chemistry, Surfaces, Coatings and Films

Electronic version(s)

https://arxiv.org/abs/2105.09593 (Access: Open)
https://doi.org/10.1021/acs.jpcc.1c06240 (Access: Closed)