Patent ID: 9343331
Filing Date: 2016-05-17
CPC Classification: H01L

Claim Text:
1. A method of manufacturing a semiconductor device provided with a stack of a first film substantially free of oxygen and a second film disposed above the first film and comprising a metal oxide containing an uneasily etched material, the method comprising: etching the second film by a first process using a first etch gas containing a boron trichloride containing gas and by a second process following the first process using a second etch gas containing an inert gas, the second etch gas being used in the second process while controlling a bias power to be equal to or greater than an etching threshold energy of the second film, wherein the uneasily etched material contains at least one material selected from the group consisting of lanthanum, yttrium, magnesium, iron, cobalt, nickel, and barium.