Chemosensor, its method of manufacture, and a method for the selective detection of analytes

This invention provides a sensor device for selectively detecting an analyte, comprising an organic field-effect transistor comprising an organic polymeric semiconductor layer connecting a source electrode and a drain electrode, and further comprising a gate electrode separated from said organic polymeric semiconductor layer by a dielectric layer, wherein said organic field-effect transistor further comprises an oligopeptide recognition sequence having from 4 to 12 amino-acids which is selective with respect to, or has selective affinity for, the analyte. This invention further provides a method to produce said sensor device, and a method for detecting an analyte by operating said sensor device.