Spin Coating Technique

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Spin casting offers a rapid, reliable method of depositing thin films from solution. It produces films in which molecular order is non-controllable (and in fact, usually produces disordered films). This method is widely employed in industry for deposition of photoresists, and more recently, active layers in organic light emitting diodes.

A few drops of solution are placed on to the surface of the substrate. The amount of solution, and rate of dropping, have little effect on the final film porperties.

The substrate is rotated at several thousand rpm. Film thickness is determined by the spinning speed (faster speeds result in thinner films) and the solution viscosity (lower viscosity gives thinner films).

 

 

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