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