Enhanced Trion Emission in Monolayer MoSe2 by Constructing a Type‐I Van Der Waals Heterostructure

Trions, quasi‐particles consisting of two electrons combined with one hole or of two holes with one electron, have recently been observed in transition metal dichalcogenides (TMDCs) and drawn increasing attention due to potential applications of these materials in light‐emitting diodes, valleytronic...

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Veröffentlicht in:Advanced functional materials 2021-10, Vol.31 (40), p.n/a
Hauptverfasser: Duan, Juanmei, Chava, Phanish, Ghorbani‐Asl, Mahdi, Erb, Denise, Hu, Liang, Krasheninnikov, Arkady V., Schneider, Harald, Rebohle, Lars, Erbe, Artur, Helm, Manfred, Zeng, Yu‐Jia, Zhou, Shengqiang, Prucnal, Slawomir
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Sprache:eng
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Zusammenfassung:Trions, quasi‐particles consisting of two electrons combined with one hole or of two holes with one electron, have recently been observed in transition metal dichalcogenides (TMDCs) and drawn increasing attention due to potential applications of these materials in light‐emitting diodes, valleytronic devices as well as for being a testbed for understanding many‐body phenomena. Therefore, it is important to enhance the trion emission and its stability. In this study, a MoSe2/FePS3 van der Waals heterostructure (vdWH) with type‐I band alignment is constructed, which allows for carriers injection from FePS3 to MoSe2. At low temperatures, the neutral exciton (X0) emission in this vdWH is almost completely suppressed. The ITrion/Ix0 intensity ratio increases from 0.44 in a single MoSe2 monolayer to 20 in this heterostructure with the trion charging state changing from negative in the monolayer to positive in the heterostructure. The optical pumping with circularly polarized light shows a 14% polarization for the trion emission in MoSe2/FePS3. Moreover, forming such type‐I vdWH also gives rise to a 20‐fold enhancement of the room temperature photoluminescence from monolayer MoSe2. These results demonstrate a novel approach to convert excitons to trions in monolayer 2D TMDCs via interlayer doping effect using type‐I band alignment in vdWH. The trion emission from monolayer MoSe2 is strongly enhanced when combined with a wider‐bandgap material FePS3. This is attributed to carrier injection from FePS3 to MoSe2 due to the formation of a type‐I band alignment between them. In addition, the trion charge state of MoSe2 can be tuned from negative to positive.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202104960