A Flexible and Wearable Photodetector Enabling Ultra‐Broadband Imaging from Ultraviolet to Millimeter‐Wave Regimes

Author:

Liu Shaojing1,Wang Ximiao1,Xu Ningsheng1,Li Runli1,Ou Hai1,Li Shangdong1,Zhu Yongsheng1,Ke Yanlin1,Zhan Runze1,Chen Huanjun1ORCID,Deng Shaozhi1

Affiliation:

1. State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information Technology Sun Yat‐sen University Guangzhou 510275 China

Abstract

AbstractFlexible and miniaturized photodetectors, offering a fast response across the ultraviolet (UV) to millimeter (MM) wave spectrum, are crucial for applications like healthcare monitoring and wearable optoelectronics. Despite their potential, developing such photodetectors faces challenges due to the lack of suitable materials and operational mechanisms. Here, the study proposes a flexible photodetector composed of a monolayer graphene connected by two distinct metal electrodes. Through the photothermoelectric effect, these asymmetric electrodes induce electron flow within the graphene channel upon electromagnetic wave illumination, resulting in a compact device with ultra‐broadband and rapid photoresponse. The devices, with footprints ranging from 3 × 20 µm2 to 50 × 20 µm2, operate across a spectrum from 325 nm (UV) to 1.19 mm (MM) wave. They demonstrate a responsivity (RV) of up to 396.4 ± 5.1 mV W−1, a noise‐equivalent power (NEP) of 8.6 ± 0.1 nW Hz0.5, and a response time as small as 0.8 ± 0.1 ms. This device facilitates direct imaging of shielded objects and material differentiation under simulated human body‐wearing conditions. The straightforward device architecture, aligned with its ultra‐broadband operational frequency range, is anticipated to hold significant implications for the development of miniaturized, wearable, and portable photodetectors.

Funder

National Natural Science Foundation of China

Changjiang Scholar Program, Ministry of Education

Basic and Applied Basic Research Foundation of Guangdong Province

Key Technologies Research and Development Program

Publisher

Wiley

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