Simple but practical methods to dice a CMOS-MEMS multi-project wafer are
proposed. On this wafer, micromachined microstructures have been
fabricated and released. In a method, a photoresist is spun on the full
wafer surface, and this photoresist is thick enough to cover all cavities
and structures on the wafer, such that the photoresist will protect the
released structures free from the chipping, vibrations, and damages in
the diamond blade dicing process. In another method, a laser dicing
system is utilized to scribe the multi-project wafer placed on a
platform, and by precisely controlling the platform moving-track, the
dicing path can be programmed to any required shape and region, even it
is not straight. In addition, the wafer backside is mounted on a
blue-tape at the beginning to enhance the process reliability.