[nano tech] NEC Makes CNT Transistor Using Only Printing Process

Feb 18, 2009
Tetsuo Nozawa, Nikkei Electronics

NEC Corp announced that it developed a technology to manufacture all the components of a carbon nanotube (CNT) transistor through a printing process.

The company made an announcement on a CNT transistor manufacturing technology in February 2008, but a printing process was used only for the channel layer at that time. The latest technology will be exhibited at the International Nanotechnology Exhibition & Conference (nano tech 2009), which takes place from Feb 18 to 20, 2009, at Tokyo Big Site.

With the new technology, it is possible to form all the components of a transistor, including electrodes, insulation films and CNT channels, only by using a printing process, according to NEC. Corrosion resistance of the areas between transistor layers, as well as lithographic properties, were enhanced by reviewing insulation ink and ink for metals, according to the company.

Moreover, because the temperature during production is less than 200°C, it is possible to use resin substrates, which are usually affected by high temperature.

A CNT transistor made by using the new technology showed p-type conductivity and an on/off ratio of approximately 1,000, according to NEC.