Multitask Multiplexed Switchable Infrared Optoelectronic Detection Based on Band Switch

Abstract

The multifunctionality and integration of detection systems have consistently been a primary focus in the development of optoelectronic devices. The structural design of functionally stacked devices facilitates the acquisition of information for complex and diverse detection tasks, significantly enhancing effective information density. However, challenges such as thermal management issues arising from high integration density and signal crosstalk between different tasks pose substantial obstacles for multifunctional detection structures. In this work, we propose a low-power, low-crosstalk, switchable multifunctional detection scheme. The effective reuse of multifunctionality is attributed to the self-isolation and low energy consumption of the three-terminal optional Schottky junction device. The built-in electric field of the Schottky junction effectively blocks majority carriers while facilitating the transport of minority carriers. This enables the device to achieve a noise current of 4.2 × 10^–27 A² Hz^–1 without requiring external bias. We demonstrate the system’s real-time edge imaging capability for letter masks and target vehicles, as well as its capacity to identify flammable hydrocarbons at concentrations as low as parts per million (ppm). This low-power, low-crosstalk multifunctional architecture presents a novel approach for the next generation of multifunctional integrated detection systems.