Semiconductor device

摘要

A semiconductor device includes an oxide layer, a source electrode layer in contact with the oxide layer, a first drain electrode layer in contact with the oxide layer, a second drain electrode layer in contact with the oxide layer, a gate insulating film in contact with the oxide layer, a first gate electrode layer overlapping with the source electrode layer and the first drain electrode layer and overlapping with a top surface of the oxide layer with the gate insulating film interposed therebetween, a second gate electrode layer overlapping with the source electrode layer and the second drain electrode layer and overlapping with the top surface of the oxide layer with the gate insulating film interposed therebetween, and a third gate electrode layer overlapping with a side surface of the oxide layer with the gate insulating film interposed therebetween.

主权项

1. A semiconductor device comprising a first transistor, the first transistor comprising:
an oxide layer comprising a channel formation region; a source electrode layer in contact with the oxide layer; a first drain electrode layer in contact with the oxide layer; a second drain electrode layer in contact with the oxide layer; a gate insulating film in contact with the oxide layer; a first gate electrode layer overlapping with a part of the source electrode layer, the first drain electrode layer, and a part of the oxide layer with the gate insulating film interposed therebetween; a second gate electrode layer overlapping with the other part of the source electrode layer, the second drain electrode layer, and the other part of the oxide layer with the gate insulating film interposed therebetween; and a third gate electrode layer overlapping with a side surface of the oxide layer with the gate insulating film interposed therebetween, wherein the first drain electrode layer and the second drain electrode layer are separated from each other by a space overlapping with the oxide layer.