Fully-printed carbon nanotube thin film transistor backplanes for active matrix organic light emitting devices and liquid crystal displays

A method for depositing an active matrix thin film transistor backplane on a substrate, said thin film transistor backplane comprising a plurality of thin film transistors and addressing electrodes, the method comprising:

• printing a first gold electrode layer on the substrate, the first gold electrode layer comprising a plurality of gold lines;
• printing an insulating layer over printed gold lines, the layer comprising insulating patches at intervals along the conductive lines;
• printing a second gold electrode layer over the printed insulating layer, the second gold electrode layer comprising a plurality of gold lines perpendicular to the gold lines of the printed first gold electrode layer to form pixel cells and electrodes to provide a transistor channel at each pixel cell;
• selectively printing semiconducting carbon nanotubes in each of said plurality of transistor channels, wherein the semiconducting carbon nanotubes have a single chirality;
• selectively printing a dielectric over each of the printed semiconducting carbon nanotubes, wherein said dielectric comprises an ionic gel;
• printing gate electrodes over said dielectric to form a plurality of thin film transistor, wherein said gate electrode comprises a conducting polymer;
• and
• printing pixel electrodes in electrical connection with an electrode of said thin film transistors.