Patent ID: 9281177
Filing Date: 2016-03-08
CPC Classification: B08B,H01L

Claim Text:
1. A method for cleaning a wafer having at least one surface comprising: holding the wafer; positioning a plate adjacent the wafer, defining a gap therebetween; attaching a mechanical wave transducer to the plate causing the plate to vibrate, wherein the mechanical wave transducer is an ultra sonic or mega sonic transducer; moving the plate and the attached mechanical wave transducer in a direction parallel to the surface of the wafer; rotating the plate and the mechanical wave transducer to rotate around an axis vertical to the plate, wherein the rotation causes the following condition to be satisfied: a distance d between point A and point O must be smaller than the radius of the plate in the time that the plate rotates π radian, wherein point A is a point on the wafer that overlays with the leading edge of the vibrating plate in the direction of plate movement and point O is the center of the plate; delivering chemical fluid on the surface of the wafer.