Patent ID: 7713886
Filing Date: 2010-05-11
Classification: C23C,H01L

Abstract:
1. A method of forming a thin film on a target substrate to be processed held in a processing chamber, comprising: performing a pretreatment on a surface of a material of an inner wall of the processing chamber, the inner wall being made of aluminum or an aluminum alloy; forming a protective film formed of a substantially nonporous anodic oxide film on the surface of the material by anodizing the pretreated surface of the material in an electrolyte solution which includes boric acid, borate, phosphate or adipate; heating the target substrate; supplying a film forming gas into the processing chamber; and heating the inner wall of the processing chamber to a temperature of equal to or greater than 140° C., wherein the film forming gas is composed of a metal alkoxide, wherein the processing chamber includes a shower head, for supplying the film forming gas into the processing chamber, and the surface of the material on which the pretreatment is performed and the protective film is formed includes a surface of the shower head, wherein the protective film has a porosity of 5% or less, and wherein the protective film produces a small amount of gas under depressurization and prevents an elution of aluminum from the surface of the material.