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Graphene ballistic nano-rectifier with very high responsivity.
Gregory Auton1,2, Jiawei Zhang1, Roshan Krishna Kumar3
1School of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, UK.
Nature Communications
|June 1, 2016
Summary
Researchers developed a novel graphene nano-rectifier, a device that rectifies electrical signals. This high-performance electronic device operates efficiently at room temperature, offering a promising alternative to cryogenic technologies.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Graphene exhibits an exceptionally long carrier mean free path, ideal for advanced electronic applications.
- Harnessing graphene's unique properties in novel devices remains a significant challenge.
- Existing sensitive detectors often require cryogenic temperatures, limiting their practical use.
Purpose of the Study:
- To demonstrate a novel electronic device utilizing graphene's ballistic transport properties.
- To fabricate a high-performance nano-rectifier capable of operating at room temperature.
- To investigate the noise characteristics and responsivity of the fabricated graphene device.
Main Methods:
- Fabrication of an asymmetric cross-junction using single-layer graphene sandwiched between boron nitride flakes.
- Characterization of carrier mobility at room temperature to confirm ballistic transport conditions.
- Measurement of voltage responsivity and noise-equivalent power under low-frequency input signals.
Main Results:
- Achieved a high carrier mobility of ~200,000 cm²/V·s at room temperature, confirming ballistic transport.
- Demonstrated a voltage responsivity of 23,000 mV/mW with low-frequency signals.
- Recorded a low noise-equivalent power of 0.64 pW/√Hz, comparable to superconducting bolometers.
Conclusions:
- The developed graphene nano-rectifier effectively harnesses ballistic transport for high-performance signal rectification.
- The device's room-temperature operation and low noise offer a significant advantage over cryogenic detectors.
- Observed output oscillations at low temperatures suggest quantum confinement effects, opening avenues for further research.
