Patent ID: 9428838
Filing Date: 2016-08-30
CPC Classification: C23F,H01J,H01L

Claim Text:
1. A plasma processing method comprising: providing a multilayer film material in a processing container where the multilayer film material is formed with a polysilicon layer, a first metal layer formed on the polysilicon layer, and a hard mask layer containing a tungsten layer formed on the first metal layer with a predetermined pattern; providing a mixed gas comprising: (a) a chloride-containing gas which includes a compound comprising: (1) a compound containing chlorine and silicon, (2) a compound containing chlorine and boron, or (3) a compound containing chlorine and hydrogen; (b) a chlorine-containing gas which contains chlorine; and (c) a processing gas which contains carbon and fluorine; and controlling a flow rate of each of the chloride-containing gas which includes a compound, the chlorine-containing gas which contains chlorine, and the processing gas; and generating plasma with the mixed gas and etching the multilayer film material from a top surface of the first metal layer to a bottom surface of the polysilicon layer with a same etching condition using the patterned hard mask layer as an etching mask.