Enhanced Trion Emission in Monolayer MoSe ₂ by Constructing a Type‐I Van Der Waals Heterostructure

Trions, quasi-particles consisting of two electrons combined with one hole or holes electron, have recently been observed in transition metal dichalcogenides (TMDCs) and drawn increasing attention due to potential applications these materials light-emitting diodes, valleytronic devices as well for being a testbed understanding many-body phenomena. Therefore, it is important enhance the trion emission its stability. In this study, we construct MoSe2/FePS3 van der Waals heterostructure (vdWH) type-I band alignment, which allows carriers injection from FePS3 MoSe2. At low temperatures, neutral exciton (X0) vdWH almost completely suppressed. The ITrion/Ix0 intensity ratio increases 0.44 single MoSe2 monolayer 20 charging state changing negative positive heterostructure. optical pumping circularly polarized light shows 14% polarization MoSe2/FePS3. Moreover, forming such also gives rise 20-fold enhancement room temperature photoluminescence Our results demonstrate novel approach convert excitons trions 2D TMDCs via interlayer doping effect using alignment vdWH.