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Related Experiment Video

Updated: Jun 22, 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

Photoelectrical response in single-layer graphene transistors.

Yumeng Shi¹, Wenjing Fang, Keke Zhang

¹School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Ave., Singapore.

Small (Weinheim an Der Bergstrasse, Germany)

|June 4, 2009

Summary

Visible light exposure causes oxygen desorption in single-layer graphene (SLG) transistors, shifting their performance. This study reveals extrinsic mechanisms dominate the photoelectrical response, suggesting new optoelectronic applications for SLG devices.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Single-layer graphene (SLG) transistors exhibit light-induced performance changes.
Understanding the mechanisms behind these changes is crucial for optoelectronic applications.

Purpose of the Study:

To investigate the effect of visible light illumination on SLG transistors.
To elucidate the dominant mechanisms governing the photoelectrical response in SLG transistors.
To explore potential strategies for light detection and optoelectronic applications using SLG.

Main Methods:

Fabrication and characterization of single-layer graphene (SLG) transistors.
Illumination of SLG transistors with visible light.
Analysis of transfer curves and hysteresis under illumination.
Investigation of SLG transistors coated with photoactive polymers.

Main Results:

Visible light illumination induced a negative shift in SLG transistor transfer curves due to oxygen desorption.
Illumination did not affect transistor hysteresis, indicating charge traps are unaffected.
Covering SLG transistors with photoactive polymers reduced the photodesorption effect, highlighting extrinsic mechanisms.

Conclusions:

The photoelectrical response of SLG transistors is primarily governed by extrinsic mechanisms, not direct photocurrent.
Oxygen desorption is a key factor in the light-induced performance shift.
SLG's properties offer a promising platform for developing novel light detectors and optoelectronic devices.