Patent ID: 8034248
Filing Date: 2011-10-11
Classification: H01L,Y02E

Abstract:
1. A dry etching method for an amorphous oxide semiconductor film containing at least In, Ga, and Zn and having an electron carrier concentration of less than 10 18 /cm 3 by use of plasma, comprising etching in a gas atmosphere containing a hydrocarbon, wherein the etching is performed with a reaction pressure in a range of 0.6 Pa or more to 3.5 Pa or less to suppress generation of a deposit of a nonvolatile material, with an RF power density in a range of 0.1 W/cm 2 or more to 20 W/cm 2 or less and with a surface temperature of the amorphous oxide semiconductor film in a range of −20° C. or more to 200° C. or less.