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- Title
Identification of excitons, trions and biexcitons in single-layer WS<sub>2</sub>.
- Authors
Plechinger, Gerd; Nagler, Philipp; Kraus, Julia; Paradiso, Nicola; Strunk, Christoph; Schüller, Christian; Korn, Tobias
- Abstract
Single-layer WS2 is a direct-gap semiconductor showing strong excitonic photoluminescence features in the visible spectral range. Here, we present temperature-dependent photoluminescence measurements on mechanically exfoliated single-layer WS2, revealing the existence of neutral and charged excitons at low temperatures as well as at room temperature. By applying a gate voltage, we can electrically control the ratio of excitons and trions and assert a residual n-type doping of our samples. At high excitation densities and low temperatures, an additional peak at energies below the trion dominates the photoluminescence, which we identify as biexciton emission. (© 2015 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)
- Subjects
EXCITON theory; PHOTOLUMINESCENCE measurement; TRIONS (Nuclear physics); THERMAL properties of semiconductors; DOPING agents (Chemistry)
- Publication
Physica Status Solidi - Rapid Research Letters, 2015, Vol 9, Issue 8, p457
- ISSN
1862-6254
- Publication type
Article
- DOI
10.1002/pssr.201510224