High speed and high density organic electrochemical transistor arrays

A generic lithographic process is presented that allows the fabrication of high density organic electrochemical transistor arrays meant to interface with aqueous electrolytes. The channels of the transistors, which were 6 mu m long, were made of the conducting polymer poly (3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) and were in direct contact with phosphate buffered saline. Source and drain electrodes and interconnects were insulated by parylene C, a biocompatible material. The transistors operated at low voltages and showed a response time of the order of 100 mu s. (C) 2011 American Institute of Physics. [doi:10.1063/1.3652912]