Study On The Electron Transport Properties Of Graphene

Graphene has unique electrical properties, since it was found to be the future of popular alternative material components, particularly in the field of nanoscale devices. To study graphene material in the device electrode application, we use graphene high electron mobility and band-gap characteristics. We build the graphene supercell contacting with the electrode structure, which can analysis the electron transport properties of graphene in contact with the electrode material in bias case.Firstly, one builds graphene supercell structure to contact with gold electrodes and rotate graphene along the Z-axis. We find the structure has the maximum transmission coefficient when the graphene supercell at 60 degrees. At this point, the carbon atoms in the carbon structure of graphene match with the gold atoms in the scattering area. When the graphene supercell is rotated at 30 degrees, the maximum current value exists in the electrode area. As electrons of the scattering region move through graphene, these electrons in graphene scatter them weakly. By analyzing the electrical conductivity, we obtained the negative differential resistance effect and the graphene electron charge and discharge oscillations in this device structure.Secondly, based on the variable band gap properties of graphene by doping atoms, one designs the boron atom and the nitrogen atom adsorptions on graphene. We compared these cases for boron and nitrogen adsorptions on graphene to open the band gap. We found that when the boron atom is in the H position and the nitrogen atom is in position B, the adsorption can bring graphene more influence.We construct the boron and nitrogen atoms adsorbed graphene and contact with the gold electrodes structure. We analyze the adsorption on the electronic transport properties of the graphene electrodes. The maximum current of the electrode is 14.7776μA, with the boron atom adsorption at T position. Adsorption of boron atoms on the graphene resulting in the electron transport properties of the electrodes is excellent. Meanwhile, when the nitrogen atom adsorbed graphene, the charge and discharge ability of electrode is better.Finally, we compare the rotation method and the absorption method. When the voltage is in the-1V～1V range, electrode conductivity value of adsorption method is greater than the rotation method. After absorbing at the boron atom or nitrogen atom, holes or electronics in graphene enhance the transport capacity of electrons in the electrode. We can conclude that boron or nitrogen atoms adsorbing Graphene affect electrode current transmission capabilities more than rotating the Graphene.