Electrochemical OFETs

The basic concept behind electrochemical OFETs is shown in Fig. 5.11. 

Dopants present in the electrolyte solution can be driven into or out of the semiconductor layer, changing the resistance several orders of magnitude. Other manipulations, such as catalysis of an analyte in the solution or at the surface can change the chemical potential and also be transduced using this technique. 

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Figure 2. (a) Schematic cross section of an organic field-effect transistor (OFET). (b) Schematic cross section of an organic electrochemical transistor (OECT). The applied source-drain voltage Vd and gate voltage Vg are also shown. 

Novel oligomers based on P-substituted thiophene derivatives were synthesised with the aim to build-up a small molecule organic field-effect transistor (OFET). The developed material, a,o)-dicyano-P,P -dibutylquaterthiophene (DCNDBQT), exhibits exeellent thermal, optical and electrochemical stability. 

Among the organic semiconductor classes used in OFETs, oligo- and polythiophenes are among the most extensively investigated due to their chemical/electrochemical stability and ready functionalization [10, 11] The first report of a polyheterocycle-based FET utilized a polythiophene [12], with... 

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