Ferroelectric Field Effect in ReS₂ via Self-Assembled Epitaxial P(VDF-TrFE) Nanowires 

Two-dimensional (2D) materials coupled with ferroelectric polymers offer a promising pathway to explore nonvolatile modulation of charge transport and programmable functionalities. We investigate the self-assembly behavior of the ferroelectric copolymer P(VDF-TrFE) on few-layer ReS₂, a transition metal dichalcogenide known for its strong in-plane anisotropy and direction-dependent electronic/optical properties. Using Langmuir–Blodgett deposition, we transfer P(VDF-TrFE) layer-by-layer onto exfoliated few-layer ReS₂ flakes and subsequently thermally anneal the films to promote crystallization and enhance molecular ordering. Atomic force microscopy reveals that the polymer forms closely packed, highly ordered nanowire arrays with average width of ~35 nm. The nanowires are aligned perpendicular to the b-axis of ReS₂, in sharp contrast to randomly oriented structures observed on SiO₂ substrates, suggesting strong structural synergy at the interface. Preliminary transport measurements on ReS₂/P(VDF-TrFE) heterostructures indicate nonvolatile electrostatic modulation of the underlying 2D channel. These results demonstrate the ability to achieve epitaxial coupling between the ferroelectric polymer and 2D materials, enabling novel flexible electronic and optoelectronic device concepts.