Characterization of Organic and Carbon Nanotube Electronic Devices Fabricated via Transfer Printing onto Plastic Substrates*

Organic and nanotube thin-film transistors (TFT) have been fabricated onto plastic substrates using transfer printing (TP). Transfer printing is a non-lithographic method that has been designed to sequentially assemble high quality TFTs onto plastic substrates. This versatile printing process avoids the use of any chemicals, temperatures or processes that are incompatible with organic materials. Fabricated pentacene TFT devices exhibit saturation, field-effect mobities up to 0.09 cm$^{2}$/Vs and an on/off ratio of approximately $10^{4}$ (similar to devices fabricated on Si wafers with a SiO$_{2}$ dielectric layer). Fabricated carbon nanotube TFT devices exhibit ambipolar behavior and show no hysteresis in the transconductance (in contrast to similar devices fabricated on Si wafers with a SiO$_{2}$ dielectric layer which exhibit only p-type behavior and have a large hysteresis).