Applicability of coating techniques for the production of organic field effect transistors

Polymer electronics circuits based on organic field effect transistors (OFETs) have the prospect of becoming low cost products. This relies mainly on the fact that the polymers are solution processable and thus can be treated with printing and coating techniques. We investigate the applicability of different coating techniques for those layers in the OFET which do not necessarily need to be patterned, i.e. the semiconductor and dielectric insulator. The results are given in respect of layer quality and transistor operation. The investigated methods are doctor blading and screen printing which have the potential for roll-to-roll processing. Both methods are compared to spin coating, which is well established but restricted to batch processing.