Patent ID: 8105661

Claim:
A method of forming a porous film on a processing target, comprising the steps of: forming fine organic particles by polymerizing a non-silicon organic compound in a gaseous phase by a plasma using a gas consisting essentially of the organic compound and an inert gas, thereby inhibiting growing oversized organic particles and controlling the average size of the fine organic particles to 10 nm or less; mixing the fine organic particles with a silicon compound containing a Si—O bond in a gaseous phase, thereby depositing a film containing the fine particles on the processing target; and removing the fine organic particles from the film, wherein the step of forming the fine organic particles and the step of depositing the film are performed in separate processing chambers, wherein the separate processing chambers are upper and lower chambers connected via an intermediate shower plate which is electrically grounded, and wherein the organic compound is supplied to the upper chamber at a flow rate which is more than 10 times that of the silicon compound supplied to the lower chamber.