Patent ID: 8084368

Claim:
A method of forming a barrier film using a coating apparatus provided with plasma generation means including a coaxial resonant cavity and a microwave supply circuit, said coaxial resonant cavity including spaced apart conductors provided on an upper portion and a lower portion of the periphery of a nonmetallic pipe for reactive gas introduction, said coaxial resonant cavity having an inner height equal to an integer multiple of one-half of the exciting wavelength, said plasma generation means being constructed such that a gas injected from one end of said nonmetallic pipe is excited into a plasma state by a microwave when said gas is in a region of said nonmetallic pipe which is not provided with said conductors and such that said gas in said plasma state is discharged from the other end of said nonmetallic pipe, said method comprising: placing an object to be coated within a vacuum chamber of said coating apparatus, said object to be coated having an insulating film with a hole and a trench formed therein; and reacting a material gas composed of Zr(BH 4 ) 4 gas with a plasma gas over a surface of said object to be coated, using ALD, to form a barrier film made of a ZrB 2 film on said insulating film and on an inner surface of said hole and an inner surface of said trench, said plasma gas being obtained by converting a reactive gas composed of H 2 gas into a plasma state by said plasma generation means.