High‐Responsivity Broadband Single‐Pixel Perovskite Imager

Abstract

Single‐pixel photodetectors have attracted significant interest as alternatives to conventional silicon‐based focal‐plane‐array image sensors owing to their simplified fabrication, high sensitivity, and compatibility with artificial intelligence (AI)‐assisted fast computational imaging. However, most reported single‐pixel photodetectors still suffer from low responsivity or limited spectral coverage, limiting imaging clarity and fidelity across the visible‐to‐near‐infrared (Vis‐NIR) spectral region. Metal halide perovskites, with high responsivity and cost‐effective fabrication, offer a promising platform for single‐pixel imaging (SPI). Here, we employ tin‐lead mixed perovskite photodetectors (Sn–Pb PPDs) incorporating a p‐type selenium‐alloyed tellurium oxide (Se–TeO x ) interlayer facilitates hole transport, suppresses Au diffusion, and inhibits Sn 2+ oxidation, thereby improving device performance and operational stability. The optimized self‐powered Sn–Pb PPD exhibits broadband detection from 300 nm to 1100 nm and a responsivity of 0.55 A W − 1 at 900 nm, the highest among reported self‐powered PPDs for SPI. Without an additional filtering circuit, the device achieved high‐fidelity 256 × 256‐pixel color imaging. Using a contour optimization algorithm, it further achieved fast, high‐quality reconstruction of 64 × 64‐pixel images under NIR illumination, at a sampling rate as low as 10%, demonstrating its potential for broadband, filter‐free, and AI‐assisted single‐pixel imaging in emerging intelligent sensing and computational imaging applications.