Patent ID: 7763320

Claim:
A film formation method for depositing an organic compound over a substrate provided in a film formation chamber; wherein said film formation chamber is kept in a high vacuum degree of 5×10 −3 Torr or lower pressure, and in the case of forming a film by depositing an organic compound material over the substrate from a deposition source provided opposite to the substrate with a movable electrode provided in a position where the deposition of the organic compound material over the substrate is not disturbed, said substrate is simultaneously heated to decrease a gas in the film, wherein temperature of said substrate is controlled to be in a range from 50° C. to 200° C., wherein an inner wall face of said film formation chamber comprises a material specularly polished by electrolytic polishing and selected from the group consisting of aluminum and stainless steel, wherein said substrate is removed from said film formation chamber after the deposition of the organic compound material, wherein the movable electrode is moved to a position opposed to a mask provided in said film formation chamber, wherein plasma is generated between the mask and the movable electrode opposed to each other in said film formation chamber by applying a high frequency electric field to a gas between the mask and the movable electrode from a high frequency power source connected to at least one of the mask and the movable electrode, and wherein the mask or an inner wall or an adhesion prevention means for preventing film formation on the inner wall is cleaned by the plasma in said film formation chamber.