Patent ID: 8268672

Claim:
A method of assembly of a first chip to a second chip comprising the steps of: providing a plurality of bond pads at a surface of the first chip with a solder composition, said bond pads being provided with an underbump metallization; providing the second chip, which, at a surface, has a plurality of bond pads on which a metallization is present; assembling the first and the second chip, such that at least part of the bond pads of the first chip and the corresponding bond pads of the second chip face each other, and forming electrical connections between the bond pads at the first and the second chip by heating, wherein the solder composition is provided as a fluid layer on the underbump metallization, which layer makes a contact angle of less than 90° with the underbump metallization, and an intermetallic compound is formed on the basis of the metallization at the second chip and at least one element of the solder composition.