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Updated: Apr 15, 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

Graphene quantum interference photodetector.

Mahbub Alam¹, Paul L Voss¹

¹Georgia Institute of Technology, School of Electrical and Computer Engineering, Atlanta, Georgia 30324-0250, USA ; UMI 2958 Georgia Tech-CNRS, Georgia Tech Lorraine, 2-3 Rue Marconi, 57070 Metz, France.

Beilstein Journal of Nanotechnology

|March 31, 2015

Summary

This summary is machine-generated.

This study simulates graphene quantum interference photodetectors, achieving up to 5.2% external quantum efficiency in a linear regime and full current switching in a second regime. These devices offer miniaturization and high efficiency without doping.

Keywords:

decoherence graphene nanoribbon phase coherence photodetector quantum interference resonant tunneling

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Area of Science:

Optoelectronics
Quantum Phenomena
Nanotechnology

Background:

Graphene nanoribbons exhibit resonant electron transmission, forming the basis for novel electronic devices.
Mach-Zehnder interferometers (MZI) are crucial for manipulating wave properties, including electron transport.
Photodetectors are essential components in optical sensing and communication systems.

Purpose of the Study:

To simulate and analyze the performance of a graphene quantum interference (QI) photodetector.
To investigate two distinct operational regimes of the graphene QI photodetector.
To evaluate the potential of graphene-based MZIs for advanced photodetector applications.

Main Methods:

Simulation of a graphene nanoribbon Mach-Zehnder interferometer (MZI).
Analysis of electron transport under low and high light intensity conditions.
Investigation of quantum interference and phase decoherence effects on photodetector performance.

Main Results:

In the linear regime, low light intensity yielded a differential current with external quantum efficiency (EQE) up to 5.2%.
In the second regime, strong photon flux induced phase decoherence, causing full current switching.
The simulated graphene QI photodetector demonstrated high EQE and potential for miniaturization.

Conclusions:

Graphene QI photodetectors can operate in distinct linear and switching regimes.
The MZI structure enables efficient light-matter interaction for photodetection.
Graphene-based photodetectors offer advantages such as small size, no need for doping, and high EQE.