Lam Research Corporation
DUAL FREQUENCY SILANE-BASED SILICON DIOXIDE DEPOSITION TO MINIMIZE FILM INSTABILITY

Abstract:

A method for performing plasma enhanced chemical vapor deposition (PECVD) using a dual frequency process to deposit a silane-based oxide film on a substrate includes arranging the substrate on a substrate support in a processing chamber configured to perform PECVD and supplying PECVD process gases into the processing chamber. The process gases include a first process gas including silicon and a second process gas including an oxidant. The method further includes, while supplying the PECVD process gases into the processing chamber, generating a dual frequency plasma within the processing chamber to deposit the silane-based oxide film on the substrate by supplying a first radio frequency (RF) voltage to the processing chamber, and supplying a second RF voltage to the processing chamber. The first RF voltage is supplied at a first frequency and the second RF voltage is supplied at a second frequency that is different than the first frequency.