Patent ID: 9013012
Filing Date: 2015-04-21
Classification: B81B,B81C

Abstract:
1. A method of forming a flexible membrane, comprising: forming a sacrificial layer over a surface of a substrate; forming a conductive electrode over the sacrificial layer, the conductive electrode including a plurality of openings with sidewalls; forming a cavity between the conductive electrode and the substrate by removing the sacrificial layer through the plurality of openings in the conductive electrode; and closing the openings by depositing a dielectric material on the sidewalls of the openings and on an upper surface of the portion of the conductive electrode, and continuing to deposit the dielectric material for a time period after the openings are closed to seal the cavity from atmosphere, wherein depositing the dielectric material includes alternatingly directing the dielectric material between a first angle of incidence and a second angle of incidence, the second angle of incidence being different from the first angle of incidence, the deposited dielectric material and the conductive electrode together forming the flexible membrane.