Studies on different configurations of cobalt phthalocyanine based flexible organic field effect transistor

Organic Field Effect Transistors (OFETs) are being investigated for a number of low-cost, large area applications; particularly those that are compatible with flexible plastic substrates. Development of low temperature processes can make way for OFETs to be integrated on flexible plastic substrates. Here we have made systematic studies on OFETs in different configurations wherein we have chosen Cobalt Phthalocyanine (CoPc) as active material. We have found the best mobility (1.86 × 10−5 cm2/V-s) in Bottom Gate Top Contact configuration. However, threshold voltage (−5V) and On off ratio (62)were found to be better in Top Gate Bottom Contact configuration The electromechanical properties of the Bottom Gate Top Contact transistors were studied by measuring the transfer characteristics of the devices in bend condition and thereby calculating mobility under different radii of bending. No significant change in the mobility of the device was observed under bent conditions.