Patent ID: 8080114
Filing Date: 2011-12-20
Classification: B08B,G03F

Abstract:
1. A cleaning process comprising: loading a wafer in a high pressure cleaner having an upper element and a lower element, each of the upper element and lower element having a pneumatic cylinder insertion unit in which a pneumatic cylinder sliding from a side can be inserted; injecting high-purity gaseous carbon dioxide (CO after sealing the high pressure cleaner by combining the upper element and the lower element and by inserting the pneumatic cylinder into the pneumatic cylinder insertion unit of the upper element and the pneumatic cylinder insertion unit of the lower element, injecting high purity CO injecting high purity CO providing a homogeneous transparent phase mixer; introducing a cleaning additive having a pressure less than 10 bar to the homogeneous transparent phase mixer; adding supercritical CO using the mixing effect caused by the pressure difference between the cleaning additive and the supercritical CO cleaning the wafer by injecting the supercritical homogeneous transparent phase mixture into the high pressure cleaner, which is at the third pressure, under the supercritical cleaning pressure; rinsing the wafer by injecting a supercritical rinsing mixture at a rinsing pressure of about 80-250 bar in which a rinsing additive and supercritical CO separating CO