Patent ID: 6849563

Claim:
A method of forming a layer of material of selected thickness on a surface using a precursor material of known viscosity, comprising the steps of: providing a source of said precursor material; providing a source ofat least one solvent for mixing with said precursor material; forming a mixture by mixing a predetermined amount of said at least one solvent with a predetermined amount of said precursor material of known viscosity to thereby change the viscosity of said precursor material to a predetermined value corresponding to that required to firm said selected thickness at a predetermined rotating frequency of said surface; monitoring and measuring the viscosity of said mixture by using sensors; providing a nozzle for dispensing said mixture; rotating said surface at said predetermined rotating frequency; supplying said mixture to said nozzle; and dispensing a predetermined volume of said mixture to said rotating surface to thereby form by spin-on deposition said layer of material of selected thickness.