Patent ID: 8026176
Filing Date: 2011-09-27
Classification: C23C,H01J,H01L

Abstract:
1. A film forming method, comprising: a step of placing a process object on a stage disposed in a process vessel, the process object having a surface and a recess opening into the surface; a film forming step including a step of generating metal particles in the process vessel by generating plasma in the process vessel, by sputtering a metal target disposed in the process vessel by the plasma, and by applying bias power to the stage to draw the metal particles into the recess and deposit the metal particles in the recess, thereby embedding the recess with a metal, wherein the film forming step is performed under conditions that the bias power is set such that, on the surface of the process object, a deposition rate which is a rate of metal deposition caused by drawing-in of the metal particles is substantially equal to an etch rate which is a rate of sputter etching caused by the plasma; a diffusion step that maintains the process object at a predetermined temperature ensuring that surface diffusion occurs in a metal film deposited in the recess under conditions such that metal particles are not generated from the metal target, and metal atoms constituting the metal film move toward a bottom portion of the recess; and a step of alternately and repeatedly performing the film forming step and the diffusion step a plurality of times.