Patent ID: 7880315
Filing Date: 2011-02-01
Classification: B81C,H01L

Abstract:
1. A micro-electronic device comprising: a first and a second element bonded together by a joining structure, comprising a first micropattern portion, a second micropattern portion, and a joining portion between the first and second micropattern portions; and a non-conductive adhesive layer formed around the joining structure, thereby securing the elements to each other, wherein the first and second micropatterns are formed from cobalt (Co), and wherein the joining portion comprises a tin (Sn) layer, wherein the sum of the thicknesses of the first and second micropatterns is at least equal to a value d, determined as wherein x represents the thickness of the solder layer or sum of the thicknesses of the solder layers, ρ represents the density of the material and wherein at % is derived from the stoechiometric composition of the final intermetallic compound, and m is the atomic mass.