Patent ID: 9437594
Filing Date: 2016-09-06
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a first transistor comprising a silicon semiconductor film including a first channel formation region; an insulating film comprising a first nitride insulating film and a second nitride insulating film over the first transistor; a second transistor comprising an oxide semiconductor film including a second channel formation region over the insulating film; and a third nitride insulating film over the second transistor, wherein the second nitride insulating film is provided between the first nitride insulating film and the oxide semiconductor film, wherein a hydrogen concentration of the second nitride insulating film is lower than a hydrogen concentration of the first nitride insulating film, wherein an etching rate of the second nitride insulating film is less than or equal to 2.0 nm/minute under a condition where etching is performed at a temperature higher than or equal to 20° C. and lower than or equal to 25° C. with the use of 0.5 wt % of hydrofluoric acid, and wherein an etching rate of the third nitride insulating film is less than or equal to 2.0 nm/minute under a condition where etching is performed at a temperature higher than or equal to 20° C. and lower than or equal to 25° C. with the use of 0.5 wt % of hydrofluoric acid.