Van der Waals Heterojunction Based Self‐Powered Biomimetic Dual‐Mode Sensor for Precise Object Identification

Abstract

The design and fabrication of materials that can concurrently respond to light and gas within the dual‐modal recognition domain present a significant challenge due to contradictory structural requirements. This innovative strategy introduces a type‐I heterojunction, combining the properties of Sb2Te3 and WSe2 nanosheets, to overcome these obstacles. The heterojunction is prepared through a precise stacking approach to create a single‐side barrier on the valence band and a near‐zero offset on the conduction band. The resulting Sb2Te3/WSe2 heterojunction demonstrates unparalleled performance, showcasing the best integrated photoelectric and gas sensing performance in a single device to date. Based on the above features, the heterojunction successfully integrates visual and olfactory sensing performance, achieving the first biomimetic visual‐olfactory dual‐mode recognition in a single device. This simulation increased the accuracy of distinguishing electric and fuel‐powered cars from ≈50% to ≈96%. This work introduces a novel approach to creating efficient, self‐powered sensing materials, paving the way for next‐generation biomimetic dual‐model devices with broad applications in environmental protection, medical care, and other fields.