Patent ID: 8697543
Filing Date: 2014-04-15
Classification: H01L

Abstract:
1. A chip-to-wafer bonding method, comprising: providing a chip and a wafer having a bonding region of the same size and shape as the chip; preparing a plurality of hydrophilic areas and a plurality of hydrophobic areas on the backside of the chip, wherein the hydrophilic and hydrophobic areas do not overlap; preparing in the bonding region a plurality of hydrophilic areas and a plurality of hydrophobic areas respectively corresponding to the hydrophilic areas and the hydrophobic areas on the chip, wherein a sum of the perimeters of the plurality of hydrophilic areas on the chip is larger than a perimeter of the chip, and a sum of perimeters of the plurality of hydrophilic areas in the bonding region is larger than a perimeter of the bonding region; adding drops of liquid onto the plurality of hydrophilic areas in the bonding region; and pre-aligning and placing the chip on the bonding region of the wafer, such that the plurality of hydrophilic areas on the chip each contacts the corresponding hydrophilic area in the bonding region via the liquid.