Method of uniformly coating a substrate

A method of coating a surface of a substrate with a polymer solution, comprising:

• mounting the substrate inside an enclosed housing;
• passing the control gas into the housing through an inlet;
• extruding the polymer solution onto the surface of the substrate in the housing;
• passing solvent-free dry, filtered gas over the coated substrate;
• spinning the substrate;
• and
• exhausting the control gas and any solvent vapor and particulate contaminants suspended in the control gas from the housing through an outlet.

A method of coating a surface of a substrate with a polymer solution, comprising:

• mounting the substrate inside an enclosed housing;
• passing the control gas into the housing through an inlet;
• extruding the polymer solution onto the surface of the substrate in the housing;
• passing the solvent-free dry, filtered gas over the coated substrate, wherein a temperature of the solvent-free dry, filtered gas is controlled;
• spinning the substrate;
• and
• exhausting the control gas and any solvent vapour and particulate contaminants suspended in the control gas from the housing through an outlet.

A method for coating a surface of a substrate with a polymer solution, comprising:

• mounting the substrate within an enclosed housing;
• extruding a solvent-bearing polymer solution onto the substrate;
• and
• controlling the evaporation of solvent form the polymer solution by adjusting an amount of solvent introduced into the housing environment, wherein adjusting the amount of solvent introduced into the housing environment comprises adjusting a degree of saturation of a control gas introduced into the housing environment by mixing a plurality of gases having a differing solvent vapor partial pressures to form the control gas.

A method for coating a surface of a substrate, comprising:

• mounting the substrate within an enclosed housing;
• extruding a solvent-bearing solution onto the substrate;
• and
• controlling the evaporation of solvent from the solution by adjusting an amount of solvent introduced into the housing environment, wherein adjusting the amount of solvent introduced into the housing environment comprises adjusting a degree of saturation of a control gas introduced into the housing environment within the range between 0% and approximately 40% by mixing a plurality of gases having different solvent vapor partial pressures to form the control gas.