In this paper the effect of shifting the chemical potential on the optical properties of graphene has been investigated at 300 K. For achieving this goal the relation between chemical potential and the electron density is calculated and then effect of electron injection from the gate of a phototransistor on chemical potential is considered and finally effect of chemical potential on optical properties of graphene has been investigated. We also studied effect of temperature on the chemical potential. Result of change in the temperature from 0 K to 300 K is 3 mev change in chemical potential at 0 V.

Keywords: Chemical potential, Phototransistor, Optical properties, Graphene

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