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Updated: Jun 18, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Published on: February 1, 2022

Ultrafast graphene photodetector.

Fengnian Xia¹, Thomas Mueller, Yu-Ming Lin

¹IBM Thomas J Watson Research Centre, Yorktown Heights, NY 10598, USA. fxia@us.ibm.com

Nature Nanotechnology

|November 7, 2009

Summary

Researchers developed ultrafast graphene photodetectors with potential bandwidths over 500 GHz. These devices offer high performance for optical applications, overcoming limitations of traditional semiconductor photodetectors.

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Graphene possesses remarkable optical properties, including broadband light absorption, yet its photonic applications remain underexplored compared to electronic uses.
Existing photodetectors often face limitations in speed and operational requirements, motivating the search for novel materials and device architectures.

Purpose of the Study:

To demonstrate ultrafast photodetectors utilizing single- and few-layer graphene.
To investigate the high-frequency photoresponse and operational characteristics of graphene-based photodetectors.

Main Methods:

Fabrication of transistor-based photodetectors using single- and few-layer graphene.
Characterization of the photodetector response to optical intensity modulations up to 40 GHz.

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Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle

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Published on: September 22, 2015

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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

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Published on: February 1, 2022

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle

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Published on: September 22, 2015

Analysis of photocarrier generation and transport mechanisms within the graphene material.

Main Results:

The graphene photodetectors exhibit photoresponse that remains stable up to 40 GHz optical intensity modulations.
Intrinsic bandwidth is estimated to potentially exceed 500 GHz, significantly surpassing conventional semiconductor photodetectors.
Devices operate with zero source-drain bias and near-zero dark current, while maintaining good internal quantum efficiency.

Conclusions:

Graphene's unique electronic and photonic properties enable the development of exceptionally high-bandwidth photodetectors.
These findings highlight graphene's potential for advanced optoelectronic applications, particularly in high-speed optical communication and sensing.
The demonstrated device performance offers a significant advancement over current photodetector technologies.