Importance

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Abstract

An electrochemical sensor according to an embodiment includes a sensor unit, provided with a transistor including a first-conductivity type semiconductor layer, a second-conductivity type first conductive region provided in the semiconductor layer, a second-conductivity type second conductive region provided in the semiconductor layer, a first insulating film provided on the semi conductor layer between the first conductive region and the second conductive region, a charge storage film on the first insulating film, a second insulating film on the charge storage film, and a reference electrode, and a control circuit tor performing control based on a comparison result between a characteristic value measured by the sensor unit and a target value with respect to the characteristic value such that a predetermined voltage is applied between the semiconductor layer and the reference electrode.

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First Claim