Preparation of Thin Film Transistors (TFTs) or Radio Frequency Identification (RFID) Tags or Other Printable Electronics Using Ink-Jet Printer and Carbon Nanotube Inks

A method for fabricating a thin film transistor (TFT), said method comprising:

• using an ink jet printer mechanism to print a substantially rectangular channel of the TFT as a composite ink mixture of metallic carbon nanotubes (m-NTs) and semiconductor carbon nanotubes (s-NTs),
• wherein the m-NTs are active and dominate the characteristics of the composite ink mixture;
• drying the composite ink mixture forming the rectangular channel;
• washing, if necessary, the composite ink mixture forming the rectangular channel to remove any unwanted residue present;
• de-activating the m-NTs in the composite ink mixture rendering the rectangular channel a semiconductor channel;
• applying a dielectric material over a portion of the semiconductor channel exposing a source area at one end of the semiconductor channel and a drain area at the other end of the semiconductor channel;
• printing electrodes of the composite ink mixture forming a gate electrode over the dielectric, a source electrode over the source area of the semiconductor channel, and a drain electrode over the drain area of the semiconductor channel;
• drying the composite ink mixture forming the gate electrode, source electrode, and drain electrode of the TFT;
• and
• washing, if necessary, the composite ink mixture forming the gate electrode, source electrode, and drain electrode of the TFT to remove any present unwanted residue.