Patent ID: 7351314

Claim:
An electrochemical deposition chamber for depositing material onto microfeature workpieces, the chamber comprising: a processing unit including a first flow system configured to convey a flow of a first processing fluid to a microfeature workpiece; a barrier unit having an upper portion with an upper channel in fluid communication with the first flow system of the processing unit, a lower portion with a lower channel, and a first external outlet at the upper portion in fluid communication with the upper channel, wherein the upper portion is detachably mounted to the processing unit such that the barrier unit is below the processing unit and the first processing fluid flows out of the chamber via the first external outlet; an electrode unit releasably coupled to the lower portion of the barrier unit such that the electrode unit is below the barrier unit and spaced apart from the processing unit, the electrode unit including an electrode and a second flow system configured to convey a flow of a second processing fluid at least proximate to the electrode, wherein the lower channel of the barrier unit is in fluid communication with the second flow system of the electrode unit; and a nonporous barrier between the upper portion and the lower portion of the barrier unit to separate the first and second processing fluids, the nonporous barrier being a material that allows either cations or anions to pass through the barrier between the first and second processing fluids.