2D Ruddlesden-Popper Perovskites/PVDF-TrFE Photodetector for Anti-Interference Vision System Derived from Ferroelectric Polarization Modulation

Abstract

2D Ruddlesden-Popper (RP) perovskites have garnered increasing attention for their excellent photoresponse, characterized by high carrier mobility, tunable bandgaps, high optical absorption, and molecular asymmetry. Herein, centimeter scale single crystal 2D hybrid perovskites, BA₂PbBr₄ (BPB) is synthesized, using quasi-static cooling method and composited with ferroelectric PVDF-TrFE(PT) film to construct a multi-field coupling photodetector (PD) via van der Waals force contact. Ferroelectric tests show that the PT film exhibits a saturated polarization strength of 3.6 µC cm⁻², allowing the ferroelectric localized field to modulate the band structure of PT and enhance the photocurrent. The Heterojunction systems exhibit ultra-high responsivity (15.3 A W⁻¹) and detectivity (1.99 × 10¹³ Jones) under 390 nm illumination at 3 V bias, with a performance improvement of over 10² times compared to BPB PDs. Furthermore, the hybrid PDs exhibit highly stable I–t curve with a photocurrent retention rate of 97.4%. Leveraging this feature, a large-area imaging device is designed at the centimeter level scale, enabling multifunctional vision applications accurate letter imaging process and anti-interference number detection. The work presents a valuable insight in design of future autonomous driving vision systems.