PEDOTPSS as Electrodes

The conductive polymer PEDOTPSS is solution based and can be deposited as an electrode in OFETs by accessing various printing techniques as 

Becker et al. followed a concept based on selective area electropolymerization of PEDOTrPSS on a prepattemed anode. The electrochemical deposited conductive polymer was transferred on a flexible substrate and a channel length of 5 pm was achieved.3  

Soft lithography (microcontact printing) was employed to pattern source and drain contacts. A poly(dimethylsiloxane) (PDMS) stamp, reproducing the electrode s layout, was used for transferring the PEDOTrPSS pattern on the substrate.353 It was possible to realize final electrode structures with a channel length of down to 2 pm.354-355 

To operate an organic field effect transistor at low bias it is necessary to avoid large contact resistance within the source-drain circuit.  

A thin coating of PEDOTrPSS on the Au contact will increase charge carrier injection from Au source contact into the pentacene layer. 

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