Patent ID: 7494848

Claim:
A method of fabricating a photo-sensing device package comprising the steps of: (a) establishing a substrate formed of a material substantially transparent to light within a predetermined range of wavelengths, said substrate having a front surface; (b) forming on said substrate front surface at least one set of patterned metal and passivation layers defining a plurality of bonding pads; (c) establishing at least one photo-sensing die having at least one photo-sensing area defined on a front side thereof; (d) forming on said photo-sensing die front side a plurality of bonding pads disposed peripherally outside said photo-sensing area; (e) forming a plurality of flipchip bumps for respective ones of said bonding pads at said photo-sensing die front side; (f) dipping said flipchip bumps of said photo-sensing die into an uncured epoxy resin based material of no-flow underfill type; (g) flipchip mounting said photo-sensing die and substrate one onto the other to form a plurality of interconnection joints disposed about said photo-sensing area, whereby said front side of said photo-sensing die is spaced by a gap from said front surface of said substrate; and, (h) forming on said passivation layer formed in step (b) a sealing structure for substantially filling the gap to establish a closed loop configuration contiguously enclosing said photo-sensing area in substantially sealed manner, whereby an internal cavity is defined thereat between said photo-sensing die and substrate, wherein said no-flow underfill type material cures at step (g) during said formation of said interconnection joints.