Flexible bimodal sensor

A flexible bimodal sensor comprising:

• a gate electrode;
• a flexible substrate;
• a source electrode disposed on the flexible substrate;
• a drain electrode disposed on the flexible substrate apart from the source electrode;
• a channel layer disposed on the source electrode and the drain electrode and a portion of the flexible substrate between the source electrode and the drain electrode;
• and
• a gate insulating layer comprising a plurality of protrusions, the gate insulating layer being disposed on the channel layer and arranged between the channel layer and the gate electrode and,
• wherein the drain electrode outputs a current signal simultaneously indicating a temperature value and a pressure value sensed by the flexible bimodal sensor, and
• the gate insulating layer comprises a base having a predetermined thickness and the plurality of protrusions extends from a first surface of the base towards the channel layer.