Patent ID: 6949396

Claim:
A corner-compensation method for fabricating MEMS (Micro-Electro-Mechanical System), comprising steps of: (a) providing a substrate; (b) forming a conductive layer on said substrate; (c) sequentially forming a masking layer having structural openings and a photoresist layer on said conductive layer; (d) executing a photolithography for etching said photoresist layer and said masking layer to form at least one hole penetrating said photoresist layer and said masking layer; (e) etching said conductive layer and said substrate to extend said at least one hole to upper portions of said substrate; (f) removing said photoresist layer and etching said conductive layer and said substrate via said structural openings and said at least one hole respectively to form deep trench structures having different depths; (g) forming a peripheral compensation structure on a side-wall portion of said deep trench structure having said different depths; (h) removing portions of said peripheral compensation structure laterally and said substrate for exposing an uncompensated silicon structure; and (i) side etching said uncompensated silicon structure to be terminated by said peripheral compensation structure around said at least one hole.