Wide-/Narrow-Bandgap Heterojunction for High Performance Differential Photodetector with Tunable Response.

Journal: Advanced science (Weinheim, Baden-Wurttemberg, Germany)
Published Date:

Abstract

Amid the rapid advancement in modern photonics and artificial intelligence, optoelectronic devices with enhanced functionalities and high performance hold great promise for complex photonic integrated circuits. Herein, a novel tunable differential photodetector (DPD) is developed based on a wide-/narrow-bandgap semiconductor heterojunction, featuring a large conduction band offset at the heterojunction interface. Benefiting from the unique band alignment at the heterojunction interface, this device exhibits interesting characteristics:1) It offers two tunable operational modes, freely switchable between "differential mode" and "normal mode" only by adjusting the bias voltages; 2) While operating in "differential mode" under zero bias, the DPD exhibits high detectivity (4.5×10 Jones) and broad bandwidth of ≈1 MHz under 1550 nm laser at room temperature; 3) Due to the narrow bandgap of PbSe, the device operates at longer wavelengths than reported to date. An equivalent circuit model is proposed to elucidate the working mechanism that is experimentally observed. The practical applications of the DPD in the event-based imaging of a moving flame and encrypted communication are further demonstrated. The work establishes a novel approach for optoelectronic devices toward multifunctional integrated photonics applications.

Authors

  • Ziyang Ren
    School of Physics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
  • Haimin Zhu
    School of Physics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
  • Weien Lai
    National Engineering Laboratory of Special Display Technology, Hefei University of Technology, Hefei, Anhui, 230009, China.
  • Yihui Zhai
    School of Physics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
  • Mengjuan Liu
    Network and Data Security Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, 610054, Chengdu, China. mjliu@uestc.edu.cn.
  • Yu Zhu
    Institutes for Systems Genetics, Frontiers Science Center for Disease-related Molecular Network, West China Hospital, Sichuan University, Chengdu 610212, Sichuan, China; Department of Bioinformatics, School of Biology and Basic Medical Sciences, Soochow University, Suzhou 215123, Jiangsu, China.
  • Hanlun Xu
    School of Physics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
  • Nasir Ali
    Mathematics, COMSATS University Islamabad, Vehari Campus, Vehari, 61100, Pakistan.
  • Ning Dai
    College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics & Astronautics, 210016, Nanjing, P.R. China.
  • Jiaqi Zhu
    State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan, China.
  • Sihan Zhao
    College of Chemistry and Pharmacy, Northwest A & F University, Yangling 712100, China.
  • Huizhen Wu
    School of Physics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.

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