Patent ID: 7808054
Filing Date: 2010-10-05
Classification: G11C,H01L

Abstract:
1. A one time programmable (OTP) memory cell including a state memory cell and a selection transistor, comprising: a semiconductor substrate including: a first insulating film being in contact with the first trench-type insulating region and formed on the lower electrode; an upper electrode of the state memory cell formed on the first insulating film; a channel region extending between the source and the drain; a second insulating film being in contact with the second trench-type insulating region and formed on the channel region; and a gate electrode of the selection transistor formed on the second insulating film, wherein a shape of at least a part of an end of the lower electrode forming region in contact with the first insulating film is sharper than a shape of an end of the channel region in contact with the second insulating film such that said sharper part is closer than a remaining part of said lower electrode to said upper electrode.