Issue 30, 2022

Enhanced excitonic features in an anisotropic ReS2/WSe2 heterostructure

Abstract

Two-dimensional (2D) semiconductors have opened new horizons for future optoelectronic applications through efficient light–matter and many-body interactions at quantum level. Anisotropic 2D materials like rhenium disulphide (ReS2) present a new class of materials with polarized excitonic resonances. Here, we demonstrate a WSe2/ReS2 heterostructure which exhibits a significant photoluminescence quenching at room temperature as well as at low temperatures. This indicates an efficient charge transfer due to the electron–hole exchange interaction. The band alignment of two materials suggests that electrons optically injected into WSe2 are transferred to ReS2. Polarization resolved luminescence measurements reveal two additional polarization-sensitive exciton peaks in ReS2 in addition to the two conventional exciton resonances X1 and X2. Furthermore, for ReS2 we observe two charged excitons (trions) with binding energies of 18 meV and 15 meV, respectively. The bi-excitons of WSe2 become polarization sensitive and inherit polarizing properties from the underlying ReS2 layers, which act as patterned substrates for top layer. Overall, our findings provide a better understanding of optical signatures in 2D anisotropic materials.

Graphical abstract: Enhanced excitonic features in an anisotropic ReS2/WSe2 heterostructure

Supplementary files

Article information

Article type
Paper
Submitted
10 Apr 2022
Accepted
21 Jun 2022
First published
15 Jul 2022
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2022,14, 10851-10861

Enhanced excitonic features in an anisotropic ReS2/WSe2 heterostructure

A. Usman, M. Adel Aly, H. Masenda, J. J. P. Thompson, S. M. Gunasekera, M. Mucha-Kruczyński, S. Brem, E. Malic and M. Koch, Nanoscale, 2022, 14, 10851 DOI: 10.1039/D2NR01973F

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