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Ultrasensitive negative capacitance phototransistors.

Luqi Tu1,2, Rongrong Cao2,3, Xudong Wang1

  • 1State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai, 200083, China.

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|January 5, 2020
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Summary
This summary is machine-generated.

Researchers developed a novel negative capacitance (NC) molybdenum disulfide (MoS2) phototransistor. This device achieves ultrahigh photodetection sensitivity by utilizing a ferroelectric gate dielectric, overcoming limitations of previous designs.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Sensitive photodetection is vital for optoelectronics.
  • Molybdenum disulfide (MoS2) shows promise for ultrasensitive photodetectors due to its unique properties.
  • Existing MoS2 photodetector enhancements often increase leakage and dark currents, reducing photodetectivity.

Purpose of the Study:

  • To develop an ultrasensitive MoS2 photodetector with improved photodetectivity.
  • To investigate the use of ferroelectric materials in MoS2-based phototransistors.
  • To address the limitations of current MoS2 photodetector designs.

Main Methods:

  • Fabrication of a MoS2 phototransistor incorporating a ferroelectric hafnium zirconium oxide film in the gate dielectric.
  • Characterization of the phototransistor's performance, including subthreshold slope and photodetectivity.
  • Analysis of the underlying mechanisms, such as photogating and negative capacitance (NC) effects.

Main Results:

  • The fabricated phototransistor exhibited a hysteresis-free, ultra-steep subthreshold slope of 17.64 mV/dec.
  • An ultrahigh photodetectivity of 4.75 × 10^14 cm Hz^1/2 W^-1 was achieved at room temperature.
  • Performance enhancement was attributed to the synergistic effects of ferroelectric-induced photogating and NC voltage amplification.

Conclusions:

  • The developed negative capacitance (NC) MoS2 phototransistor significantly enhances photodetection performance.
  • Ferroelectric integration offers a promising strategy to overcome challenges in MoS2 photodetector design.
  • This work provides a new pathway for advancing optoelectronic devices.