Patent ID: 9490179
Filing Date: 2016-11-08
CPC Classification: H01L

Claim Text:
1. A semiconductor element comprising: a single crystal semiconductor layer over a substrate, the single crystal semiconductor layer comprising a channel formation region between a source region and a drain region; a gate insulating film over the channel formation region; a gate electrode overlapping with the channel formation region and being in direct contact with the gate insulating film; a source electrode electrically connected to the source region through a first opening portion formed in the gate insulating film; and a drain electrode electrically connected to the drain region through a second opening portion formed in the gate insulating film, wherein the gate insulating film is a stacked-layer film comprising a first insulating film comprising silicon and oxygen, a second insulating film comprising silicon and oxygen, and a film comprising gallium and oxygen between the first insulating film and the second insulating film, wherein a concentration of gallium is 35 at. % to 50 at. % and a concentration of oxygen is 50 at. % to 65 at. % in the film comprising gallium and oxygen, wherein the film comprising gallium and oxygen has a relative permittivity of 10 or more, and wherein a total thickness of the gate insulating film between the gate electrode and the single crystal semiconductor layer is greater than or equal to