Hysteresis-controlled Van der Waals tunneling infrared detector enabled by selective layer heating

TL;DR

This paper introduces a novel mid-infrared photodetector based on a Van der Waals tunnel structure with hysteresis control via selective layer heating, enabling efficient weak-light detection and layer-specific heat transfer studies.

Contribution

It presents a new layered tunnel photodetector with hysteresis control and demonstrates selective layer heating using mid-IR light, advancing infrared detection and heat transfer research.

Findings

Achieved large photovoltage (0.05-1 V) under weak illumination.

Demonstrated threshold-based photoswitching with voltage jumps.

Enabled selective heating of van der Waals layers using mid-IR light.

Abstract

Mid-infrared (mid-IR) photodetectors play a crucial role in various applications, including the development of biomimetic vision systems that emulate neuronal function. However, current mid-IR photodetector technologies are limited by their cost and efficiency. In this work, we demonstrate a new type of photodetector based on a tunnel structure made of two-dimensional materials. The effect manifests when the upper and lower layers of the tunnel structure are heated differently. The photoswitching is threshold-based and represents a ``jump'' in voltage to another branch of the current-voltage characteristic when illuminated at a given current. This mechanism provides enormous photovoltage (0.05$-$1~V) even under weak illumination. Our photodetector has built-in nonlinearity and is therefore an ideal candidate for use in infrared vision neurons. Additionally, using this structure, we demonstrated the possibility of selective heating of layers in a van der Waals stack using mid-IR illumination. This method will allow the study of heat transfer processes between layers of van der Waals structures, opening new avenues in the physics of phonon interactions.