Waterfall Rinsing Apparatus for Uniform Substrate Drying

The patent introduces solvent vapor (gas phase) into the rinsing bath (liquid phase) to create a two-phase system. The solvent vapor condenses on the substrate surface during rinsing, creating a controlled evaporation environment that prevents harmful evaporation of bath fluid while maintaining cleaning effectiveness. This phase transition approach resolves the contradiction by adding a gas phase component to manage liquid phase evaporation.

The patent introduces an intermediary substance (solvent vapor) that mediates between the rinsing bath fluid and the substrate surface. This intermediary solvent vapor absorbs excess bath fluid through capillary action and controlled evaporation, preventing direct evaporation of the bath fluid from the substrate surface. The intermediary substance thus protects the substrate from streaking and residue while maintaining the cleaning function.

The patent changes the physical and chemical parameters of the rinsing environment by introducing solvent vapor at controlled concentrations. This modifies the surface tension, viscosity, and evaporation rate of the bath fluid, creating conditions that prevent particle re-attachment while maintaining effective drying. The parameter changes in the vapor phase directly influence the liquid phase behavior at the substrate surface.

The patent creates different local conditions at different zones of the substrate surface during rinsing. By controlling solvent vapor distribution, the patent creates zones with different evaporation rates and surface tension gradients, allowing uniform drying while preventing particle re-attachment in critical areas. The local quality of the vapor-liquid interface varies across the substrate surface.

The patent substitutes chemical methods (pH adjustment) with physical methods (solvent vapor introduction) to control particle re-attachment. Instead of changing the chemical composition of the rinsing bath, the patent uses physical vapor phase processes to achieve the same protective effect. This replacement of chemical mechanisms with physical ones simplifies the chemistry while maintaining effectiveness.

The patent creates an inert vapor environment above the rinsing bath that prevents particle re-attachment without changing the bath chemistry. The solvent vapor forms a protective atmosphere that inhibits particle adhesion through physical means rather than chemical reactions, avoiding the complexity of modified rinsing fluid chemistry while achieving the desired contamination reduction.