Effect of intrinsic polymer properties on the photo sensitive organic field-effect transistors (Photo-OFETs)

In this work, we have demonstrated how the intrinsic properties of a conjugated polymer can influence the electro-optical characteristics of photo sensitive organic field - effect transistors (Photo-OFETs). Photo-OFETs fabricated with three batches of poly2-methoxy,5-(3',7'-dimethyl-octyloxy)-p-phenylene vinylene (MDMO-PPV) were investigated in the scope of our work. Photo-OFETs were fabricated with the polymers, than electrically and electro-optically characterized. It was observed that the channel current and the field-effect mobility increase with increasing polymer molecular weight. Interestingly, the electro-optical characteristics and photo switching properties of the transistors were found to depend on the polydispersity (PDI) of the polymer as well. These results are explained in terms of influences of chain packing, ordering and trap density on the FET switching properties and transistor parameters. Display Omitted Photo-OFETs fabricated with three batches of poly2-methoxy,5-(3',7'-dimethyl-octyloxy)-p-phenylene vinylene (MDMO-PPV)Photo-OFETs were fabricated with the polymers, than electrically and electro-optically characterizedIt was observed that the channel current and the field-effect mobility increase with increasing polymer molecular weightThe electro-optical characteristics and photo switching properties were found to depend on the polydispersity (PDI)