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Issue 2, 2019
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Controlling the Dirac point voltage of graphene by mechanically bending the ferroelectric gate of a graphene field effect transistor

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Abstract

Controlling the Dirac point voltage of graphene is essential for realizing various practical applications of graphene. Here, control of the doping state is achieved in flexible graphene field effect transistors (GFETs) by applying mechanical bending stress. By gradually increasing the bending strain (the decrease of upward/downward bending radius), the Dirac point (VDirac) linearly shifts to left/right, which is induced by the flexoelectric effect of the ferroelectric Pb0.92La0.08Zr0.52Ti0.48O3 (PLZT) gate. In addition, a superior mechanical antifatigue character is obtained in the flexible GFETs, and the doping effect is recoverable. The sensitivity to strain and high bending stability not only offer an easy, controllable and nonintrusive method to obtain a specific doping level in graphene for flexible electric devices, but also highlight the enormous potential of the flexible ferroelectric PLZT-gated GFETs as wearable sensors.

Graphical abstract: Controlling the Dirac point voltage of graphene by mechanically bending the ferroelectric gate of a graphene field effect transistor

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Supplementary files

Article information


Submitted
23 Nov 2018
Accepted
30 Nov 2018
First published
30 Nov 2018

Mater. Horiz., 2019,6, 302-310
Article type
Communication
Author version available

Controlling the Dirac point voltage of graphene by mechanically bending the ferroelectric gate of a graphene field effect transistor

G. Hu, J. Wu, C. Ma, Z. Liang, W. Liu, M. Liu, J. Z. Wu and C. Jia, Mater. Horiz., 2019, 6, 302
DOI: 10.1039/C8MH01499J

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