Patent ID: 9373523
Filing Date: 2016-06-21
CPC Classification: H01L

Claim Text:
1. A semiconductor device manufacturing method, comprising; heating a substrate to a target temperature at which the difference between a first etching rate and a second etching rate falls within a target range, the first etching rate being an etching rate of reactive on etching of a film containing a meta disposed on a bottom of a first groove that has an opening width smaller than a prescribed value, the first groove being formed on the substrate and having the film on an inner surface thereof, and the second etching rate is an etching rate of reactive on etching of the film disposed on a bottom of a second groove that has an opening width equal to or greater than the prescribed value, the second groove being formed on the substrate and having the film on an inner surface thereof; and performing reactive on etching of the film disposed on the bottom of the first groove and the film disposed on the bottom of the second groove at a same time under a same process in a state where the substrate is heated to the target temperature, wherein the prescribed value is 20 nm, wherein the target temperature is set based on a characteristic that the first etching rate increases as the temperature of the substrate increases and a characteristic that the second etching rate decreases as the temperature of the substrate increases, and wherein the film is an aluminum-based film containing any one of AlON, AlN and Al