Patent ID: 7604011

Claim:
A method for cleaning a wafer, comprising: disposing a wafer between a first plurality of transducers and a second plurality of transducers such that the first plurality of transducers are positioned above a top surface of the wafer and such that the second plurality of transducers are positioned below a bottom surface of the wafer, wherein the first plurality of transducers positioned above the top surface of the wafer includes transducers of different shape that each have a same surface area size facing the top surface of the wafer, and wherein the second plurality of transducers positioned below the bottom surface of the wafer mirrors the first plurality of transducers positioned above the top surface of the wafer with regard to a shape and a size of each transducer, such that each transducer in both the first and second pluralities of transducers is defined to have approximately a same surface area size facing the wafer; exposing the wafer to a supercritical fluid; and operating the first and second plurality of transducers to generate and transfer acoustic energy through the supercritical fluid to the wafer.