Patent ID: 9589925
Date: 2017-03-07
CPC Classifications: B23K,H01L

Claim:
1. A method for bonding with a silver paste, the method comprising steps of: coating the silver paste, which contains silver and indium, on a semiconductor device or a substrate; placing the semiconductor device on the substrate; and heating the silver paste to form a bonding layer, wherein the semiconductor device and the substrate are bonded to each other through the bonding layer, wherein the indium contained in the silver paste is 40 mole % or less, wherein each of the silver and the indium have a spherical particle shape and the silver paste contains a plurality of spherical silver particles and a plurality of spherical indium particles, wherein the step of forming the bonding layer comprises steps of: heating the silver paste to transform the spherical indium particles into an indium liquid; covering surfaces of the spherical silver particles with the indium liquid; contacting the indium liquid which covers the surfaces of the spherical silver particles with an adjacent indium liquid; diffusing the indium liquid into the spherical silver particles while also diffusing the spherical silver particles into the indium liquid to form a bonding region which joins the spherical silver particles to each other, and wherein, in the step of diffusing the indium liquid into the spherical silver particles, all of the indium liquid diffuses into the spherical silver particles.