Integration of CMOS Biosensor into a Polymeric Lab-on-a-Chip System

We present an integration approach of a CMOS biosensor into a polymer based microfluidic environment suitable for mass production. It consists of a wafer-level-package for the silicon die and laser bonding process promoted by an intermediate hot melt foil to attach the sensor package to the microfluidic chip, without the need for dispensing of glues or underfiller. A very good condition of the sensing area was obtained after introducing a protection layer during packaging. A microfluidic flow cell was fabricated and shown to withstand pressures up to ∆p = 780 kPa without leakage. The employed biosensors were electrically characterized in a dry environment. Keywords—CMOS biosensor, laser bonding, silicon polymer integration, wafer level packaging.