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

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.

Rivera, A.M.University of Puerto Rico (författare)
Dash, Saroj Prasad,1975Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)saroj (författare)
Dey, SandwipArizona State University (författare)
Katiyar, R.S.University of Puerto Rico (författare)
Sahoo, S.Homi Bhabha National Institute (HBNI) (författare)
University of Puerto RicoIowa State University (creator_code:org_t)

Av författaren/redakt...: Gaur, A.P.S.; Rivera, A.M.; Dash, Saroj Pras ...; Dey, Sandwip; Katiyar, R.S.; Sahoo, S.

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