Sensor device capable of measuring electric field strength of an external electric field and method for measuring external electric field

A method for measuring an external electric field using a sensor device capable of measuring electric field strength of an external electric field, and the sensor device comprises:

• a first dielectric layer;
• a first atomic layer material film disposed on the first dielectric layer and including one or more atomic layers formed of a first material;
• a channel layer disposed on the first atomic layer material film, including a channel region, and including one or more atomic layers of graphene;
• a second atomic layer material film disposed on the channel layer and including one or more atomic layers formed of a second material;
• and
• a first electrode and second electrode disposed on the channel layer across the channel region in a manner facing each other,
• wherein the second atomic layer material film includes a first side and a second side, the first side being disposed on the channel layer and a second dielectric layer being disposed above the second side and the portion on the side opposite from the channel region of the side of the second dielectric layer opposite from the second atomic layer material film being exposed to the outside, the method comprising:
• measuring a current value flowing between the first electrode and second electrode while the external electric field is being applied to the sensor device;
• and
• determining electric field strength of the external electric field based on the current value.