Patent ID: 7998776

Claim:
A method for manufacturing a thin film of a Micro-Electro-Mechanical System (MEMS) sensor, comprising steps of: a) forming a medium layer on a top surface of a single-crystal silicon wafer via a deposition process, and the medium layer functioning as a mask layer; b) partly removing the medium layer in order to form a mask diagram; c) etching the single-crystal silicon wafer from the mask diagram via a Deep Reactive Ion Etching (DRIE) process to form a plurality of trenches extending into an inner side of the single-crystal silicon wafer; d) partly etching the single-crystal silicon wafer through the mask diagram via an independent isotropic DRIE process, to form an inner chamber and a plurality of remainder single-crystal silicon chips under the medium layer, the trenches being in communication with the inner chamber, the remainder single-crystal silicon chips forming a meshwork silicon film; e) removing the medium layer from the single-crystal silicon wafer in order to expose the meshwork silicon film, via a dry etching process or a wet etching process; and f) finally, expanding a single-crystal silicon film based on the meshwork silicon film via an epitaxial growth process, the single-crystal silicon film covering the meshwork silicon film to shield the trenches, the inner chamber being located under the single-crystal silicon film.