I am trying to obtain transfer curve (Vg, gate voltage vs. Id, drain current) with graphene transistor using 2636A Keithley source-meter. Device basic structure is attached.
I have put drain voltage fixed as 30 mV and made the gate voltage sweep from -20 V to 20 V. When the gate voltage is negative, I am getting perfect curve as it should be theoretically. But when the gate voltage appears as positive, I am getting negative current. I have attached the curve I have obtained. Your kind suggesting is requested to come out from this predicament.
Back gate oxide is about 300 nm and the gate current is 1e-8 A... Please suggest me.
Graphene transistors have ambipolar behaviour. In order to obtain the transfer curve you should change the sign of Id(drain current) data from negative to positive for the values that correspond to positive Vg (gate voltage). These values of current correspond to electron mobility(negative charge) thus appear negative under positive bias
If the structure is large enough, you could call in the assistance of a theorist and ask them to construct a simulation based on my latest QED model, please see link to my latest paper on the subject for more details, if required:
https://www.researchgate.net/publication/310845873_The_Foldy-Wouthuysen_and_scattering_matrix_method_for_calculating_the_transmission_of_electrons_through_two_dimensional_graphene_electrons_like_light
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