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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
Mobility-dependent low-frequency noise in graphene field-effect transistors.
Yan Zhang1, Emilio E Mendez, Xu Du
1Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800, United States.
ACS Nano
|September 15, 2011
Summary
Low-frequency 1/f noise in graphene transistors depends on carrier mobility. Suspended graphene shows lower noise due to higher mobility, offering potential for advanced electronic materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Low-frequency 1/f noise is a critical parameter in electronic devices, impacting performance.
- Graphene field-effect transistors (GFETs) are promising for next-generation electronics.
- Understanding noise mechanisms in GFETs is essential for device optimization.
Purpose of the Study:
- To investigate the low-frequency 1/f noise in suspended and on-substrate GFETs.
- To analyze the dependence of noise on gate voltage and temperature.
- To elucidate the relationship between noise, carrier mobility, and scattering mechanisms.
Main Methods:
- Fabrication and characterization of suspended and on-substrate GFETs.
- Low-frequency noise measurements across a temperature range (300 K to 30 K).
- Analysis using a generalized Hooge's relation and correlation with DC transport measurements.
Main Results:
- Noise amplitude away from the Dirac point follows a generalized Hooge's relation.
- The Hooge parameter α(H) decreases monotonically with device mobility, showing universal, temperature-independent behavior.
- Disorder dynamics influence α(H), independent of DC transport characteristics.
- Scattering mechanisms and charge carrier inhomogeneity contribute to noise variations near the Dirac point.
Conclusions:
- Suspended GFETs exhibit significantly lower 1/f noise than on-substrate devices due to higher carrier mobility.
- The findings provide insights into noise origins in graphene, crucial for electronic device design.
- Graphene's tunable noise properties offer advantages over traditional electronic materials.
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