Patent ID: 9024205
Filing Date: 2015-05-05
Classification: B23K,H01L,H05K

Abstract:
1. A microelectronic assembly, comprising: a first substrate having a surface and a first conductive element; a second substrate having a surface and a second conductive element; and an electrically conductive alloy mass joined to the first and second conductive elements, wherein the conductive alloy mass includes a first material, a second material, and a third material, the third material selected to increase the melting point of an alloy including the third material and at least one of the first material or the second material, wherein a concentration of the first material varies from a relatively higher amount at a location disposed toward the first conductive element to a relatively lower amount toward the second conductive element, wherein a concentration of the second material varies in concentration from a relatively higher amount at a location disposed toward the second conductive element to a relatively lower amount toward the first conductive element, and wherein the third material has a highest concentration at a location between a first highest concentration of the first material and a second highest concentration of the second material.