Chemical field-effect transistor
Type of field-effect transistor / From Wikipedia, the free encyclopedia
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A ChemFET is a chemically-sensitive field-effect transistor, that is a field-effect transistor used as a sensor for measuring chemical concentrations in solution.[1] When the target analyte concentration changes, the current through the transistor will change accordingly.[2] Here, the analyte solution separates the source and gate electrodes.[3] A concentration gradient between the solution and the gate electrode arises due to a semi-permeable membrane on the FET surface containing receptor moieties that preferentially bind the target analyte.[3] This concentration gradient of charged analyte ions creates a chemical potential between the source and gate, which is in turn measured by the FET.[4]