Patent ID: 7343922

Claim:
A wafer drying apparatus, comprising: a) a sealable dry chamber; b) a wafer liquid bath disposed in the dry chamber and adapted to contain a cleaning solution; c) means for gradually removing at least a portion of a wafer submerged in the cleaning solution through a surface of the cleaning solution; d) vapor generating means for generating organic liquid vapor from an organic liquid and controlling a supply of the organic liquid vapor such that the organic liquid vapor can be supplied at at least two volumetric supply rates, the vapor generating means including: a bubbling chamber containing the organic liquid; bubbling gas sources of different pressures; a bubbling gas supply pipe system having a first end installed in a lower part of the bubbling chamber, and a second end branching out into a plurality of branch pipes which are connected to respective ones of the bubbling gas sources of different pressures; and pressure control means located in the bubbling gas supply pipe system between the bubbling chamber and the bubbling gas sources; and e) an organic liquid vapor supply pipe for supplying the organic liquid vapor generated by the vapor generating means to the dry chamber.