Patent ID: 8492793

Claim:
A semiconductor device comprising: a first semiconductor layer, which is made of Si 1−X Ge X (0<x≦1); a gate electrode, which is formed on the first semiconductor layer through a gate insulating film and has two sides opposite to each other; a source electrode, which is formed on one of the two sides of the gate electrode and on the first semiconductor layer, the source electrode being made of a compound of a metal and a second semiconductor including Ge; a drain electrode, which is formed on the other of the two sides of the gate electrode and on the first semiconductor layer, the drain electrode being made of a compound of the metal and a material of the first semiconductor layer; and a silicon (Si) thin film as a tunnel barrier, which is formed between the source electrode and the first semiconductor layer and in contact with the source electrode, wherein an edge portion on a gate side of the source electrode and an edge portion on a gate side of the drain electrode have a positional relationship of being asymmetrical to a gate side of the gate electrode, such that the edge portion on the gate side of the drain electrode is spaced farther away from an edge portion of the gate electrode in a gate length direction than the edge portion on the gate side of the source electrode.