Patent ID: 7368791

Claim:
A method for constructing a semiconductor transistor, comprising: forming a local bottom gate electrode on a substrate; forming a first insulating layer on the bottom gate electrode; depositing an iron catalyst on the first insulating layer; growing a semiconducting carbon nanotube from the iron catalyst such that the carbon nanotube is chemically bonded to the iron catalyst and is located on the first insulating layer over the local bottom gate electrode, the semiconducting carbon nanotube having an elongate axis, source and drain ends, and a channel portion between the source and drain ends; forming source and drain conductors over the respective source and drain ends of the semiconducting carbon nanotube; forming a second insulating layer on the source and drain conductors and the channel portion of the semiconducting carbon nanotube; and forming a local top gate electrode over the channel portion of the semiconducting carbon nanotube, the local top gate electrode, in at least one cross-section transverse to the elongate axis of the semiconducting carbon nanotube, being electronically disconnected from the local bottom gate electrode, the local bottom gate electrode and the local top gate electrode being located such that when a voltage is applied to the local top and bottom gate electrodes, the source and drain conductors are electrically coupled through the semiconducting carbon nanotube.