Patent ID: 7775219

Claim:
A substrate processing apparatus, comprising: a chamber having a chamber lid including a substrate transfer assembly opening and an interior volume sized to receive a single substrate, wherein the interior volume further comprises: a lower volume configured to maintain a liquid at a predetermined depth; an upper volume configured to at least partially confine a gaseous atmosphere above the liquid; a transducer assembly disposed in the lower volume; a plurality of transducer assemblies disposed near an interface between the upper and lower volume; an exhaust system coupled to the chamber lid configured to remove vapors from the upper volume, wherein the exhaust system includes a switchable valve to vary the application of negative pressure within the upper volume, and wherein the exhaust system includes a plurality of exhaust opening that are formed in the chamber lid and in communication with a source of negative pressure; and an outlet port coupled to the exhaust system, wherein at least a portion of the plurality of exhaust openings have different diameters and the exhaust openings are arranged relative to the outlet port in a gradually-increasing, smallest-diameter-to-largest-diameter pattern such that the exhaust opening or openings with the smallest diameter are arranged closest to the outlet port relative to other exhaust openings and the exhaust opening or openings with the largest diameter are arranged furthest from the outlet port relative to other exhaust openings.