Patent ID: 7768014
Filing Date: 2010-08-03
Classification: H01L

Abstract:
1. A memory device comprising: a semiconductor film comprising a first impurity region and a second impurity region provided over an insulated surface; a first insulating film over the semiconductor film; a second insulating film over the first insulating film; a first opening portion formed in the first insulating film and the second insulating film over the first impurity region; a second opening portion formed in the first insulating film and the second insulating film over the second impurity region; a first conductive film functioning as one of a source electrode and a drain electrode electrically connected to the first impurity region at the first opening portion and functioning as a lower electrode, wherein the first conductive film is provided over the second insulating film and is extended into the first opening portion to be in contact with a side surface of the first insulating film and a side surface of the second insulating film; a second conductive film functioning as the other of the source electrode and the drain electrode electrically connected to the second impurity region at the second opening portion, wherein the second conductive film is provided over the second insulating film and is extended into the second opening portion; an insulator provided over the first conductive film at the first opening portion and over the second conductive film at the second opening portion; and an upper electrode provided over the insulator and in the first opening portion and the second opening portion, wherein an edge of the first conductive film and an edge of the second conductive film are in contact with the second insulating film.