A method of forming a microphone forms a backplate, and a flexible
diaphragm on at least a portion of a wet etch removable sacrificial
layer. The method adds a wet etch resistant material, where a portion of
the wet etch resistant material is positioned between the diaphragm and
the backplate to support the diaphragm. Some of the wet etch resistant
material is not positioned between the diaphragm and backplate. The
method then removes the sacrificial material before removing any of the
wet etch resistant material added during the prior noted act of adding.
The wet etch resistant material then is removed substantially in its
entirety after removing at least part of the sacrificial material.