Bipolar Photoresponse in Graphene/GaN Heterostructure and its Secure Function in Free‐Space Optical Communication

Author:

Zhang Shifeng1,Hu Anqi1,Liu Qiaoli1,Xu Li1,Ren Xiansong1,Wang Bo1,Ren Yanling1,Liu Wenyu2,Zhou Xingye3,Chen Shanshan2,Guo Xia1ORCID

Affiliation:

1. State Key Laboratory for Information Photonics and Optical Communications School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

2. Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Natural Materials & Micro‐nano Devices Renmin University of China Beijing 100872 China

3. National Key Laboratory of Solid‐State Microwave Devices and Circuits Hebei Semiconductor Research Institute Shijiazhuang 050051 China

Abstract

AbstractThe free‐space optical communication is regarded as a promising technique for next generation networks. However, all the data are exposed in free space with high risk of being attacked or eavesdropping by unauthorized parties. Here, a bipolar photodetector based on the graphene/GaN heterojunction is demonstrated. The polarity of the UV light photocurrent is opposite to that of the red light photocurrent, which results from the interface state filling effect and hot carrier injection into graphene, verified by Kelvin probe force microscope measurement results. Four stable photocurrent levels are demonstrated with only a single graphene/GaN heterojunction via the photocurrent polarity control, which is employed for a secure capability in conventional optical communication by setting visible and UV light as secret and key information, respectively. The technique provides a new strategy to design photodetectors for information encryption technology.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Hebei Province Outstanding Youth Fund

Publisher

Wiley

Subject

Electronic, Optical and Magnetic Materials

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