Patent ID: 6174371
Filing Date: 2001-01-16
Classification: H01L

Abstract:
A substrate treating apparatus for heating a substrate in an atmosphere including vapor of a treating liquid, comprising:treating vapor mixture generating means for generating a treating vapor mixture by mixing the vapor of the treating liquid with a diluting gas;a treating chamber for receiving said treating vapor mixture;a substrate support table disposed in said treating chamber, heated to a predetermined temperature and for supporting the substrate;a substrate lift mechanism for raising and lowering the substrate between a separate position away from said substrate support table and a resting position on said substrate support table;partial pressure ratio adjusting means for varying a mixing quantity of at least one of the vapor of the treating liquid and the diluting gas, so that a partial pressure ratio of the vapor of the treating liquid in the treating vapor mixture generated by said treating vapor mixture generating means increases with time; anddrive control means for controlling downward displacements of the substrate lowered by said substrate lift mechanism from said separate position to said resting position in said treating chamber, according to variations in the partial pressure ratio of the vapor of the treating liquid in said treating vapor mixture, to maintain a substantially fixed ratio between a vapor pressure and a saturation pressure of the vapor of the treating liquid in the treating vapor mixture adjacent a surface of said substrate under treatment.