Patent ID: 7214324
Filing Date: 2007-05-08
Classification: B81B,B81C

Abstract:
1. A method for manufacturing micro-electro mechanical (MEM) structures, comprising the steps of: forming a cavity into a first side of a first wafer that functions as a handling wafer, wherein a sidewall of the cavity forms a first angle greater than 54.7 degrees with respect to a plane defined by the first side of the handling wafer, wherein the first angle extends from the plane into the cavity to the sidewall, and wherein the first angle subtends at least a portion of the cavity; performing a bulk etch on the first side of the handling wafer to modify the sidewall of the cavity to a second angle greater than about 90 degrees with respect to a plane defined by the first side of the handling wafer, wherein the second angle extends from the plane into the cavity to the sidewall, and wherein the second angle subtends at least a portion of the cavity; and bonding a second side of a second wafer to the first side of the handling wafer to cover the cavity such that the cavity is inaccessible, wherein the second side of the second wafer is opposite a first side of the second wafer, wherein the second wafer is an epitaxial wafer, and wherein the epitaxial wafer includes a buried etch stop layer positioned at a desired depth from the first side of the epitaxial wafer.