Patent ID: 7438788

Claim:
A reactor for electrochemical processing of microelectronic workpieces, comprising: a reaction vessel; a workpiece processing zone at an upper portion of the reaction vessel; a first electrode compartment in the reaction vessel located below the processing zone; a second electrode compartment in the reaction vessel located below the processing zone and concentric with the first electrode compartment; a first electrode in the first electrode compartment and a second electrode in the second electrode compartment; a first partition in the reaction vessel and having an upwardly extending annular first lip and a first section joined to the first lip and extending radially outwardly from the first lip; a second partition in the reaction vessel and having an upwardly extending annular second lip and a second section joined to the second lip, with an annular fluid flow path formed between the first and second lips; an interface member in the reaction vessel positioned substantially vertically, or at an upwardly inclined angle, between the first and second partitions, wherein the interface member is configured to prevent selected matter in the processing fluid from passing to the processing zone.