Patent ID: 7191787

Claim:
An apparatus for cleaning a wafer, comprising: a volume configured to contain a supercritical fluid in contact with a wafer when present in the volume, the volume defined to have a first side opposite a top surface of the wafer when present in the volume, the volume defined to have a second side opposite a bottom surface of the wafer when present in the volume; a first plurality of transducers disposed across the first side of the volume and in communication with the volume, wherein the first plurality of transducers includes transducers of different shape; and a second plurality of transducers disposed across the second side of the volume and in communication with the volume, wherein the second plurality of transducers is defined to mirror the first plurality of transducers with regard to a configurations of each transducer, wherein each of the transducers is capable of applying acoustic energy to the supercritical fluid to be contained within the volume.