Manipulation of exciton and trion quasiparticles in monolayer WS2 via charge transfer

Anand P.S. Gaur, Adriana M. Rivera, Saroj P. Dash, Sandwip Dey, Ram S. Katiyar, Satyaprakash Sahoo

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15 Scopus citations


Charge doping in transition metal dichalcogenide is currently a subject of high importance for future electronic and optoelectronic applications. Here, we demonstrate chemical doping in the CVD-grown monolayer (1L) of WS2 by a few commonly used laboratory solvents by investigating the room temperature photoluminescence (PL). The appearance of distinct trionic emission in the PL spectra and quenched PL intensities suggests n-type doping in WS2. The temperature-dependent PL spectra of the doped 1L-WS2 reveal a significant enhancement of trions emission intensity over the excitonic emission at low temperature, indicating the stability of trion at low temperature. The temperature-dependent exciton-trion population dynamic has been modeled using the law of mass action of trion formation. These results shed light on the solution-based chemical doping in 1L-WS2 and its profound effect on the photoluminescence which is essential for the control of optical and electrical properties for optoelectronic applications.

Original languageEnglish (US)
Article number173103
JournalApplied Physics Letters
Issue number17
StatePublished - Oct 21 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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