Patent ID: 7425510
Filing Date: 2008-09-16
Classification: B08B,H01J

Abstract:
1. A fabrication method comprising: subjecting a substrate to a fabrication process in a processing chamber that causes polymer to adhere to surfaces at different regions inside the processing chamber, respectively; subsequently removing the substrate from the processing chamber; and removing the polymer from the surfaces in several stages of a cleaning process, wherein the stages are carried out sequentially, and wherein the stages include providing cleaning gas, including an O-based gas and at least one gas selected from the group consisting of an F-based gas and a Cl-based gas, exciting the cleaning gas using a source power to form a plasma, and exposing the polymer inside the processing chamber to the plasma while regulating the pressure inside the processing chamber, wherein each of the stages is carried out according to a process recipe specifying the ratio of the volumetric flow rates at which the gases constituting the cleaning gas are to be provided, the pressure to be maintained in the processing chamber, and the magnitude of the source power used to form the plasma, and wherein the process recipes of the stages of the cleaning process are different from each other, and the process recipe of each of the stages is formulated to maximize the effectiveness of the plasma as an etchant in removing the polymer from one of the surfaces.