Patent ID: 7847209

Claim:
A method of forming a metal oxide film in a plasma treatment chamber having a gas-barrier property on a surface of a predetermined substrate by plasma CVD using a treatment gas which contains a gas of an organometal and an oxidizing gas, said method comprising: executing a low power glow discharge so as to carry out a reaction chiefly between the organometal contained in the treatment gas and thereby form a first CVD film on the surface of the substrate, and executing a high power glow discharge so as to react the organometal with the oxidizing gas and thereby form a second CVD film on the first CVD film, wherein: (a) the low power glow discharge and the high power glow discharge are executed in the same plasma treatment chamber; (b) the same organometal is employed for the low power glow discharge and the high power glow discharge; and (c) the low power glow discharge and the high power glow discharge are executed at the same frequency, wherein said glow discharge is carried out in a microwave electric field, said low power is in a range of 20 to 90 watts, said high power is in a range of not lower than 100 watts, and an output power of said microwave electric field is continuously changed from said low power up to said high power.