Patent ID: 8283257

Claim:
A method for processing a semiconductor workpiece, comprising: positioning a process head proximate to a semiconductor workpiece with a region between the process head and the workpiece, the region being fixed relative to the process head; while the process head is proximate to the semiconductor workpiece, changing the chemistry of the region by exposing a portion of the semiconductor workpiece surface to a first chemistry having a first chemical composition, removing the first chemistry, exposing the portion to a second chemistry having a second chemical composition different than the first chemical composition, and removing the second chemistry; prior to rinsing the portion of the workpiece surface, sequentially exposing the portion to the first and second chemistries again without rinsing the portion of the workpiece surface between the operations of exposing the portion to the first chemistry and exposing the portion to the second chemistry again; and rinsing and drying the portion after sequentially exposing the portion to each of the first and second chemistries at least twice, and removing the first and second chemistries.