Self-driven photodetection based on impedance matching effect between a triboelectric nanogenerator and a MoS 2 nanosheets photodetector

Lei Han, Mingfa Peng, Zhen Wen, Yina Liu, Yi Zhang, Qianqian Zhu, Hao Lei, Sainan Liu, Li Zheng*, Xuhui Sun, Hexing Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Constructing electronic systems without an external power source is urgently required toward self-powered photodetection. In this work, we proposed a self-driven photodetection system with a MoS 2 nanosheets photodetector as light intensity sensor, a vertical contact-separate mode triboelectric nanogenerator (CS-TENG) as power source, and several LEDs as alarm. The MoS 2 based planar photodetector was fabricated by conventional photolithography technique and lift-off process. It is highly sensitive for visible light illumination with high current on-off ratio and excellent reproducibility characteristics under light on-off switching. When conjuncting these functional devices, the induced output voltage of the CS-TENG is tuned by the load resistance of the photodetector, which is responded to the light intensity. The mechanism can be ascribed to the impedance matching effect between specific output characteristics of TENG and working status of photodetector. By adding a Zener diode acts as a voltage regulator, the self-driven renders the voltage and current varying from 1.58 to 20.60 V and 0.06–4.78 μA in a range of light intensity from 0 to 3.19 W/m 2 , respectively. Finally, it is demonstrated that the output of CS-TENG varies with the variable working states of the MoS 2 photodetector and then accurately reflects on the lighted number of LEDs.

Original languageEnglish
Pages (from-to)492-499
Number of pages8
JournalNano Energy
Volume59
DOIs
Publication statusPublished - May 2019

Keywords

  • Impedance matching effect
  • MoS nanosheets photodetector
  • Photodetection
  • Self-driven
  • Triboelectric nanogenerator

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