A method for forming a MEMS device is disclosed, where a final release
step is performed just prior to a wafer bonding step to protect the MEMS
device from contamination, physical contact, or other deleterious
external events. Without additional changes to the MEMS structure between
release and wafer bonding and singulation, except for an optional
stiction treatment, the MEMS device is best protected and overall process
flow is improved. The method is applicable to the production of any MEMS
device and is particularly beneficial in the making of fragile
micromirrors.