Patent ID: 8174114
Filing Date: 2012-05-08
Classification: H01L

Abstract:
1. A semiconductor package structure, comprising: a substrate having a front side and a back side; a semiconductor chip directly mounted on the front surface of the substrate by means of solder bumps; a thermally-conductive stiffener mounted over the front surface of the substrate and surrounding the chip, the stiffener having a first portion and a second portion, wherein a top surface of the first portion is between a top surface and a bottom surface of the semiconductor chip to form an indentation between the semiconductor chip and the second portion surrounding the semiconductor chip, the second portion is directly disposed on the top surface of the first portion, the first portion adjoins the substrate, and the first portion of the stiffener is spaced apart from the chip; an underfill layer filled and cured in a gap between the semiconductor chip and the substrate; a plurality of solder balls mounted on the back surface of the substrate; and a heat spreader in contact with the second portion for sealing the semiconductor chip therein by an adhesive interposed between the heat spreader and the second portion, wherein the first portion is wider than the second portion thereby creating an indentation between the heat spreader and the first portion.