Photonics Research, Volume. 12, Issue 12, 2989(2024)

Operation mode-switchable photodetector with a pn junction local-floating gate

Yurong Jiang, Zhi Wang, Wenqian Xing, Chuanzheng Liao, Xiaohui Song, Xueping Li, and Congxin Xia*
Author Affiliations
  • School of Physics, Henan Key Laboratory of Advanced Semiconductor & Functional Device Integration, Henan Normal University, Xinxiang 453007, China
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    Figures & Tables(4)
    Device structure and electrical characterizations. (a) Schematic diagram, (b) optical microscopy image, (c) AFM image, (d) Raman spectra of WSe2/MoS2 heterojunctions, (e) I-V curves of WSe2 transistor and PNLFG-PD, (f) transfer curves of WSe2 transistor and PNLFG-PD.
    Switchable operation mode between dark and light conditions. (a) Anti-ambipolar characteristics in dark and (b) p-type unipolar characteristics in light. (c) Comparison of transport curves under dark and light conditions. Semi-log I-V characteristics (d) in dark and (e) in light. (f) Comparison of I-V characteristics under dark and light. Linear I-V characteristics (g) in dark and (h) in light. (i) Vf depending on oxidation time in dark and light.
    High photodetection performances. I-V curves under different light intensity at the forward bias. (a) Linear curves ranged from 0 to 3 V, (b) semi-log curves from 1.4 to 1.9 V, (c) semi-log curves from −3 to 3 V. Variation in responsivity and detectivity with the bias Vds for (d) PN junction PD and (e) PNLFG-PD. (f) Responsivity and detectivity as a function of light power. (g) Photoswitching at Vds=2 V. (h) Enlarged photoresponse with the response (τrise) and recovery (τdecay) times. (i) Performance comparison with previous reports.
    Working mechanism of switchable operation mode. (a) Photocurrent within the spectra. (b) ln (I/V2) versus 1/V plots under different light intensity. (c) Barrier height as a function of light intensity. Energy band diagrams (d) in dark and (e) in light. (f) Energy band diagram at light-on state to illustrate the photoinduced barrier-lowering mechanism.
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    Yurong Jiang, Zhi Wang, Wenqian Xing, Chuanzheng Liao, Xiaohui Song, Xueping Li, Congxin Xia, "Operation mode-switchable photodetector with a pn junction local-floating gate," Photonics Res. 12, 2989 (2024)

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    Paper Information

    Category: Optoelectronics

    Received: Jul. 23, 2024

    Accepted: Oct. 14, 2024

    Published Online: Dec. 2, 2024

    The Author Email: Congxin Xia (xiacongxin@htu.edu.cn)

    DOI:10.1364/PRJ.529267

    CSTR:32188.14.PRJ.529267

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