Biosensor with porous wicking layer

An organic thin film transistor based sensor for detecting the presence of an analyte in a hydrophilic liquid sample, the sensor including:

• a porous polymer wicking layer having a first surface and a second surface, wherein the first surface is configured to receive a liquid sample;
• an enzyme disposed on or within the porous polymer wicking layer, the enzyme for facilitating the generation of a charge carrier from an analyte;
• a polymer gating layer in contact with the second surface of the porous polymer wicking layer, and configured to be connected to an ohmic conductor for applying a gate voltage to the polymer gating layer, the polymer gating layer being conductive to the charge carrier;
• and
• an organic semiconducting layer configured to be connected to and between a source electrode and a drain electrode,
• wherein the porous polymer wicking layer is a different material than the polymer gating layer.