Identification of excitons, trions and biexcitons in single‐layer WS2. Issue 8 (27th July 2015)

• Record Type: Journal Article
• Authors: Plechinger, Gerd; Nagler, Philipp; Kraus, Julia; Paradiso, Nicola; Strunk, Christoph; Schüller, Christian; Korn, Tobias
• Is Part Of: Physica status solidi. Volume 9:Issue 8(2015:Aug.)
• Page Start: 457
• Page End: 461
• Publication Date: 2015-07-27
• Subjects: Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201510224
• Languages: English
• ISSNs: 1862-6254

Abstract

<abstract abstract-type="main" id="pssr201510224-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 &amp;Co. KGaA, Weinheim)</p> </abstract>