Low-energy electron-irradiation effect on transport properties of graphene field effect transistor

Abstract

We study the effects of low-energy electron beam irradiation up to 10 keV on graphene based field effect transistors. We fabricate metallic bilayer electrodes to contact mono- and bi-layer graphene flakes on SiO${}_2$, obtaining specific contact resistivity ${\rho }_c\simeq 19k\Omega \mu m^2$ and carrier mobility as high as 4000 cm${}^2$V${}^{-1}$s${}^{-1}$. By using a highly doped p-Si/SiO${}_2$ substrate as back gate, we analyze the transport properties of the device and the dependence on the pressure and on the electron bombardment. We demonstrate that low energy irradiation is detrimental on the transistor current capability, resulting in an increase of the contact resistance and a reduction of the carrier mobility even at electron doses as low as 30 $e^{-}/n{m}^2$. We also show that the irradiated devices recover by returning to their pristine state after few repeated electrical measurements.

arXiv comment10 pages, 5 figures

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Cited by in corpus (4)

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• Pressure-Tunable Ambipolar Conduction and Hysteresis in Ultrathin Palladium Diselenide Field Effect Transistors
• Effect of Electron Irradiation on the Transport and Field Emission Properties of Few-Layer MoS2 Field Effect Transistors
• Electron irradiation on multilayer PdSe${}_2$ field effect transistors