Patent ID: 8586418

Claim:
Method for the production of an electronic component having at least one semiconductor component that forms a waste heat source during operation, on the front side of a semiconductor substrate ( 1 ), wherein the back side (RS) that faces away from the component is provided with a back-side metallization ( 2 ) and is connected, in heat-conductive manner, with a heat sink ( 6 ), in a soldering process, using a solder layer ( 4 ) that contains Sn, and wherein a metallization ( 3 ) is deposited also on pass-through openings (KL) between front side and back side, through the substrate, wherein a first Au layer ( 23 , 33 ), an intermediate layer ( 24 , 34 ) composed of a material different from Au and Sn, and a second Au layer ( 25 , 35 ) are deposited for the back-side metallization ( 2 ) and the metallization ( 3 ) of the pass-through openings (KL), one after the other, and wherein a material that forms a diffusion barrier for a liquid AuSn phase and prevents spread of a liquid AuSn phase formed during the soldering process, in place of the second Au layer, into the first Au layer, is selected for the intermediate layer, wherein the second Au layer ( 35 ) is deposited with a lesser thickness on the side walls of the pass-through openings, and the wettability for material of the solder layer is reduced at the surface (OF 3 ), as compared with the thickness and wettability of second Au layer ( 25 ) on the back side of the substrate.