Enhanced excitonic features in an anisotropic ReS2/WSe2 heterostructure

Arslan Usman, M. Adel Aly, Hilary Masenda, Joshua J. P. Thompson, Surani M. Gunasekera, Marcin Mucha-Kruczynski, Samuel Brem, Ermin Malic, Martin Koch

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)10851-10861
Number of pages11
Issue number30
Early online date15 Jul 2022
Publication statusPublished - 14 Aug 2022

ASJC Scopus subject areas

  • Materials Science(all)


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