Patent ID: 6479410
Filing Date: 2002-11-12
Classification: C23C,H01L

Abstract:
A processing method for an object to be processed comprising the steps of:mounting an object to be processed on a mounting stand provided within a film-formation chamber; performing a film-formation process on said object to be processed by supplying a film-formation gas containing at least fluorine into said film-formation chamber; mounting a protective plate of aluminum nitride in place of said object on said mounting stand, said protective plate being of a same size as said object; introducing a cleaning gas including CF4 into said film-formation chamber to form a plasma, thereby cleaning the interior of said film-formation chamber; and performing a plasma pre-coating step after said step of introducing a cleaning gas by introducing a pre-coating gas that does not contain fluorine into said film-formation chamber while said protective plate is still mounted on said mounting stand to thereby form on inner walls of the film formation chamber, a pre-coating film into which fluorine included in said cleaning gas and remaining within the film formation chamber is sealed.