Patent ID: 6692579
Filing Date: 2004-02-17
Classification: B08B,C11D,H01L

Abstract:
A method for cleaning a semiconductor structure, comprising the steps of:a) providing a variable pressure cleaning chamber containing a quantity of a cleaning agent and having a volume; said cleaning chamber having a pressure-tight piston; whereby said volume of said cleaning chamber can be decreased to a minimum volume by lowering said piston and increased to a maximum volume by raising said piston; b) placing a semiconductor structure into said cleaning chamber with said piston positioned to provide said maximum volume; whereby said cleaning agent is in vapor phase; c) lowering said piston; whereby said vapor phase cleaning agent in contact with said semiconductor structure condenses to a liquid phase; d) raising said piston; whereby said cleaning agent vaporizes; and e) repeating steps c and d until said semiconductor structure is sufficiently clean by removing any contaminant from said semiconductor structure.