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

Dash, Saroj Prasad, 1975 (författare): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

AIP Publishing, 2019
2019
Engelska.
Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 115:17

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Abstract Ämnesord

Stäng

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.

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

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