Te microwire/2D Organic-inorganic Hybrid Perovskite Heterojunction Self-Powered Polarization Photodetector for Imaging and Communication Encoding

Abstract

Organic-inorganic hybrid perovskite ferroelectrics with a two-dimensional (2D) structure offer a unique pathway for selfpowered polarization detection, yet their performances is often limited by insufficient anisotropic ratios and carrier separation efficiency. 1D Te microwires exhibits strong broad spectral response, high carrier mobility and pronounced structural anisotropy. In this study, 2D single crystal (EA)2(MA)2Pb3Cl10 (EMPC3) with millimeter scale was synthesized by temperature-lowering method from a saturated solution. The Te microwires prepared by chemical vapor deposition (CVD) method was coated on EMPC3 crystal to obtain the Te/EMPC3 heterojunction. Due to the synergistic effect of the ferroelectric photovoltaic effect of EMPC3 and the built-in electric field of heterojunction, the Te/EMPC3 device exhibits significantly enhanced self-powered photoresponse performances in the 280-1006 nm, showing the highest peak responsivity in the solar blind ultraviolet region. Te/EMPC3 device at 280 nm and 0 V exhibits a higher on/off ratio up to 103, responsivity of 2. 34 A W -1 , specific detectivity of 4.5×10 12 Jones, rise/decay time of 43/33 ms, and dichroic ratio of 3.0, respectively, compared to EMPC3 PD at 1.2 V (on/off ratio of 178, 0.95 A W -1 , 1.1×10 12 Jones, response time of 105/103 ms, and dichroic ratio of 1.8). The significantly enhanced anisotropy ratio renders the device highly promising for applications in polarization imaging and dual-wavelength encrypted communications. This demonstrates the potential of the heterojunction system as a new platform for next-generation, self-powered, polarization-sensitive optoelectronics.