Patent ID: 6497785
Filing Date: 2002-12-24
Classification: H01L

Abstract:
A wet chemical process tank having improved fluid circulation comprising:a tank body having a bottom wall and two sidewalls, a first endwall and a second endwall perpendicularly joined to said bottom wall forming a fluid-tight cavity for holding a liquid therein; said cavity adapted for holding a plurality of semiconductor wafers in an upright position therein; said first endwall and said two sidewalls being of the same height, while said second endwall being at least 0.5 cm shorter than said first endwall for inducing a liquid flow over said second endwall when said liquid enters and overfills said cavity from a liquid inlet positioned juxtaposed to said first endwall; and a liquid dispenser positioned on and supported by said bottom wall of the tank body having an elongated body and generally rectangular shaped cross-section connected on one end juxtaposed to said first endwall in fluid communication with said liquid inlet, said elongated body having a liquid passageway therein in fluid communication with a plurality of openings provided on a vertical side of the body allowing liquid to exit the body in a horizontal direction, said plurality of openings increases in size from a first opening adjacent to said first endwall to a second opening adjacent to said second endwall by at least 50%.