Embodiments of MEMS devices include a movable layer supported by overlying
support structures, and may also include underlying support structures.
In one embodiment, the residual stresses within the overlying support
structures and the movable layer are substantially equal. In another
embodiment, the residual stresses within the overlying support structures
and the underlying support structures are substantially equal. In certain
embodiments, substantially equal residual stresses are be obtained
through the use of layers made from the same materials having the same
thicknesses. In further embodiments, substantially equal residual
stresses are obtained through the use of support structures and/or
movable layers which are mirror images of one another.