Realising ultrafast perovskite photodetectors via 2D synergy for optical communication and sensitive light detection

Abstract

The realization of high-speed optical communication and sensitive light detection with self-powered perovskite photodetectors (PDs) is imperative for advancing AI-driven optoelectronic systems, including visible light communication (VLC), surveillance, and environmental monitoring, necessitating exceptional detectivity and an ultrafast response. Herein, we introduce a 2D synergy strategy employing Ti₃C₂T_x MXene to simultaneously enhance charge carrier transport, suppress defect states, and improve film morphology in perovskite films via percolation networks and surface passivation. The resultant self-powered perovskite PD achieves a dark current density of 1.46 × 10⁻¹⁰ A cm⁻², a detectivity of 6.59 × 10¹² Jones, a linear dynamic range exceeding 181 dB, and ultrafast response times (rise: 1.07 μs, fall: 0.74 μs), alongside robust stability with negligible degradation over continuous cycles. This work demonstrates integration of the optimized PD into an optical communication system, enabling ASCII-encoded signal reception across 460–730 nm and a sensitive light detection setup for low-light applications. Significantly, the optimized PD propels the advent of energy-efficient, high-speed optoelectronics, fostering unprecedented opportunities in AI-driven technologies.