Organic field-effect transistor based sensors with sensitive gate dielectrics used for low-concentration ammonia detection

► A novel OFET-sensor concept based on an active-sensing dielectric is presented. ► The concept provides inherent semiconductor protection against air exposure. ► The concept provides a promising platform for integrated, smart sensor systems. ► The concept was successfully evaluated with ammonia as gaseous analyte. ► The sensor mechanism is attributed to generated mobile ions in the dielectric.