Patent ID: 7049695
Filing Date: 2006-05-23
Classification: H01L

Abstract:
1. A method for providing heat dissipation for a semiconductor device chip, the device chip having a front side adjacent to which heat-generating devices are formed and having a backside, the method comprising the steps of: providing a heat spreader, forming a first layer of a first metal on the backside of the chip; forming a second layer of said first metal on a front side of the heat spreader; forming a third layer of a second metal, different from the first metal, on at least one of the first layer and the second layer; and bonding the first layer, second layer and third layer in a bonding process wherein the third layer is between the first layer and the second layer, thereby forming a bonding layer including an alloy of the first metal and the second metal, the bonding layer providing a thermal conducting path from the chip to the heat spreader with a thermal conductance in a range of about 1.0 W/cm° C. to about 4 W/cm° C.