Patent ID: 7726323

Claim:
A device for treating with a liquid a wafer-shaped article, the device comprising: a chuck for holding a wafer-shaped article with one surface facing said chuck, said chuck comprising at least one gas conduit for directing a gas supplied through said chuck upwardly toward said one surface of a wafer to be held by said chuck, lateral guide pins positioned about a periphery of said chuck radially outside a peripheral edge of a wafer to be held by said chuck, and a gas guide in a periphery of said chuck and located at least in part radially inwardly of said lateral guide pins; wherein said gas guide comprises an edge facing radially inwardly of chuck and confronting gas flowing radially outwardly of said chuck parallel to a wafer-shaped article to be held by said chuck, wherein said gas guide diverts said gas supplied through the chuck downwardly at a position located a predetermined distance radially inward of the lateral guide pins and away from uppermost surfaces of the chuck that are intermediate the lateral guide pins and said position.