Patent ID: 8790992
Filing Date: 2014-07-29
Classification: B81C,H01L

Abstract:
1. A method for bonding two surfaces at low temperatures comprising: forming at a low temperature a first bonding layer on a first substrate and a second bonding layer on a second substrate, wherein at least one of the first substrate or the second substrate comprises one or more components, micro-components or circuits, wherein the first bonding layer and the second bonding layer each have an exposed surface, and the formation of each bonding layer is done at a low temperature that is less than or equal to 300° C.; conducting a first annealing of the first and second bonding layers on the first and second substrates for a first annealing time period, wherein the first annealing is conducted up to and at an annealing temperature that is higher than the low temperature of formation of each bonding layer and is at least 350° C. but less than 450° C. and for a time which does not deleteriously affect the components, micro-components or circuits; assembling the annealed first and second substrates to form a structure by bringing into contact the exposed surfaces of the first bonding layer and the second bonding layer; and conducting a second annealing of the first and second bonding layers of the bonded first and second substrates after assembling the structure, with the second annealing conducted at a second temperature of at least 350° C. and lower than or at most equal to the first annealing temperature, wherein the second annealing is conducted at a temperature and time which does not deleteriously affect the components, micro-components or circuits, and wherein the annealings provide a bonding interface between the substrates that has a bonding energy of at least 4 J/m