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Monolithically Integrated Flexible Black Phosphorus Complementary Inverter Circuits.

Yuanda Liu1,2, Kah-Wee Ang1,2

  • 1Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3, 117583, Singapore.

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|June 28, 2017
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Summary
This summary is machine-generated.

Researchers developed a flexible complementary inverter using a single black phosphorus (BP) nanosheet. This monolithic integration enables high-performance flexible logic circuits with tunable properties and enhanced stability.

Keywords:
black phosphoruscomplementaryflexibleinvertermonolithic integrated

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Area of Science:

  • Materials Science
  • Electronics Engineering
  • Nanotechnology

Background:

  • Flexible logic circuits traditionally require complex heterogeneous integration of multiple materials.
  • Developing monolithic, high-performance inverters on flexible substrates remains a significant challenge.

Purpose of the Study:

  • To demonstrate a monolithically integrated complementary inverter using a single black phosphorus (BP) nanosheet on flexible substrates.
  • To achieve effective threshold voltage tuning within a single BP material for both n-type and p-type field-effect transistors (FETs).

Main Methods:

  • Utilized homogeneous black phosphorus (BP) nanosheets on flexible substrates.
  • Achieved controllable electron concentration via aluminum (Al) donor doping for BP n-FETs.
  • Employed work function engineering for low Schottky barrier contact electrodes to enhance hole injection in BP p-FETs.

Main Results:

  • Demonstrated a BP n-FET with a room-temperature on/off ratio exceeding 103.
  • Enhanced BP p-FET current density by 9.4 times through improved hole injection.
  • Achieved a flexible inverter with clear voltage inversion, DC voltage gain >1, and AC signal switching up to 100 kHz.
  • Exhibited remarkable electrical stability under mechanical bending down to 4 mm radii.

Conclusions:

  • Presented a practical monolithic integration strategy for functional logic circuits on a single material platform.
  • Paved the way for future high-density flexible electronic applications using black phosphorus.
  • Highlighted the potential of tunable BP properties for advanced flexible electronics.