Interfacial\nPolarization Enhanced Ultrafast Carrier\nDynamics in Ferroelectric CuInP<sub>2</sub>S<sub>6</sub>

Two-dimensional (2D) ferroelectric materials hold great\npotential\nfor various electronic applications, including nonvolatile memory,\nferroelectric field-effect transistors, and functional sensors. Cooperative\nphenomena associated with ferroelectricity-modulated carrier dynamics\nin the 2D context have primarily remained unexplored. To address this\ngap, we investigate the photoinduced dynamics in CuInP<sub>2</sub>S<sub>6</sub> (CIPS) and elucidate the relationship between photoexcited\ncarrier dynamics and interfacial polarizations. The intrinsic polarization\nsubstantially prolongs the carrier lifetime assisted by the mitigation\nof Cu<sup>+</sup> ions. Additionally, the intralayer carrier recombination\nwithin CIPS is significantly accelerated by 2 orders of magnitude\nupon the formation of heterojunctions with graphene. The carrier dynamics\nexhibit clear dependence on interfacial polarizations, thereby facilitating\nthe spatial separation of photoinduced carriers. The findings lay\nthe groundwork for future investigation of 2D ferroelectric materials,\npaving the way for ferroelectric memory and computing technology for\nindustrial applications.