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In this work, a hybrid integration of few-layer transition metaldichalcogenides (TMDCs) and ferroelectric polymer is designed to achievepassive control of optical properties in-situ. The electrical polarization inferroelectric P(VDF-TrFE) polymer can regulate the photoluminescence (PL) infew-layer TMDCs. The total PL intensity is substantially suppressed or enhancedunder opposite polarization in bilayer WSe2. This is because electrons transferbetween valley K and {\Lambda} in the conduction band induced by the built-inelectric field in P(VDF-TrFE) polymer. This charge transfer further changes thecompeting dynamics between direct and indirect exciton recombination path andoverall optical radiation efficiency. We also illustrate that the engineered PLoriginates from external electric field dependent transferred electron effect.The theoretical result matches the experimental data well. This workdemonstrates a device platform in which passive regulation is achieved using 2DTMDCs modulated by polarized ferroelectric materials.

Exciton emissions in bilayer WSe2 tuned by the ferroelectric polymer