Patent ID: 7926444

Claim:
A film-forming device used for forming a thin film on a surface of a substrate by supplying a coating solution to the substrate having asperities on the surface thereof, the film-forming device comprising: a treatment chamber for receiving a substrate and isolating the substrate from the air; a solvent-gas-supplying portion for supplying a solvent gas into the treatment chamber; a holding portion for rotatably holding the substrate so that the downward-facing surface of the substrate is the surface to which the thin film is formed, the holding portion being provided in the treatment chamber; a coating-solution-supplying portion for supplying a coating solution as a mist of charged particles upward toward the surface of the substrate by spraying the particles in a direction oblique to the downward-facing substrate surface, the coating-solution-supplying portion being disposed in the treatment chamber; a charging portion for charging the substrate with an electrical potential opposite to the charge of the particles; and a lifting and holding section for adjusting a relative distance between the substrate held by the holding portion and the coating-solution-supply portion, said relative distance preventing sprayed particles having a size greater than a predetermined particle size from contacting the downward-facing surface of the substrate due to gravity, whereby only those sprayed particles having particle sizes less than the predetermined particle size electrostatically adhere to the surface of the substrate.