Patent ID: 8709913
Filing Date: 2014-04-29
Classification: H01L

Abstract:
1. A method of forming a microelectronic assembly comprising the steps of: providing a microelectronic element having a major surface, and a dielectric layer and at least one bond pad exposed at the major surface, the microelectronic element containing a plurality of active circuit elements, wherein a height of the at least one bond pad above the major surface differs from a height of the dielectric layer above the major surface, the dielectric layer of at least one of the elements being compressible to absorb any dimensional tolerances; providing a second element having a coefficient of thermal expansion of less than 10 ppm/° C., the second element having a major surface and a dielectric layer exposed at the major surface of the second element; forming a first metal layer such that a first portion of the first metal layer overlies the at least one bond pad and a second portion of the first metal layer overlies the dielectric layer of the microelectronic element; forming a second metal layer overlying the dielectric layer of the second element; and joining the first metal layer with the second metal layer.