Patent ID: 8421129

Claim:
A semiconductor device comprising: a source electrode, a drain electrode, and a channel layer provided between the source electrode and the drain electrode, the channel layer being formed of (N+1) carbon nanotube patches (N is a positive integer) each having a size smaller than a channel length in a direction of a channel, the (N+1) carbon nanotube patches connecting between the source electrode and the drain electrode to thereby form the channel layer, wherein the (N+1) carbon nanotube patches comprise a first carbon nanotube patch of a first layer and a second carbon nanotube patch of a second layer, the first carbon nanotube patch comprising a plurality of carbon nanotubes and having a first carbon nanotube density, the second carbon nanotube patch comprising a plurality of carbon nanotubes and having a second carbon nanotube density, a part of the first carbon nanotube patch of the first layer and a part of the second carbon nanotube patch of the second layer being overlapped with each other with an overlap width so as to form an overlap portion and so that the channel layer comprises a remaining part of the first carbon nanotube patch having a first width, a remaining part of the second carbon nanotube patch having a second width, and the overlap portion having the overlap width, the remaining part of the first carbon nanotube patch having the first carbon nanotube density, the remaining part of the second carbon nanotube patch having the second carbon nanotube density, the overlap portion having a third carbon nanotube density obtained by adding the second carbon nanotube density to the first carbon nanotube density, and each of the first, the second, and the third carbon nanotube densities representing the number of the carbon nanotubes per unit length.