Patent ID: 7291913

Claim:
A method for removing heat from a semiconductor device on a substrate, comprising: forming a lid having at least one cavity; a first die of a first thickness and a second die of a second thickness different from the first thickness mounted on a substrate; depositing a conductive material having a viscosity within the at least one cavity, the conductive material comprising a material having a thermal conductivity greater than 10 W/m-° C.; mating the lid to the substrate thereby placing the at least one cavity over the first die and the second die; and heating the conductive material thereby reducing its viscosity and thereby forming a first layer of the conductive material having a third thickness between the first die and the lid and a second layer of the conductive material having a fourth thickness different from the third thickness between the second die and the lid; cooling the conductive material thereby increasing the viscosity of the conductive layers, thereby retaining the thickness of the first conductive layer and the second conductive layer within the at least one cavity, lifting the lid and the conductive layers from the dies and the substrate; applying additional binding material between the lid and the dies and the substrate; and mating the lid to the substrate, thereby securing the lid to the substrate.