Patent ID: 8802553

Claim:
A method, comprising: forming a layer of solder material on a semiconductor chip, the layer of solder material having a first main surface and a second main surface, the first main surface being adjacent the semiconductor chip and the second main surface comprising a rough surface; pressing the second main surface of the layer of solder material directly on a substantially smooth surface of a carrier at a first temperature below a melting temperature of the solder material; applying a second temperature to the layer of solder material, wherein applying the second temperature to the layer of solder material comprises heating the solder material to a temperature that is below the melting temperature of the solder material thereby forming intermetallic phases between a first portion of the layer of solder material and the substantially smooth surface of the carrier; and heating the layer of solder material to a third temperature that is higher than the melting temperature of the solder material but lower than a melting temperature of the intermetallic phases thereby melting a second portion of the layer of solder material.