Method for producing a connection between component parts, and component made of component parts

A component comprising:

• a first component part;
• a second component part;
• and
• a through-via,
• wherein the first component part has a first insulation layer and the second component part has a second insulation layer,
• wherein the through-via is an AuSn alloy and electrically conductively connects the first component part to the second component part,
• wherein the through-via is arranged in a first opening of the first insulation layer and in a second opening of the second insulation layer, and is completely enclosed in lateral directions by both the first insulation layer and the second insulation layer,
• wherein the through-via is an AuSn eutectic which is formed in one piece,
• wherein the first and second openings form a common closed cavity,
• wherein, at least in places, the common closed cavity has a larger lateral extent than the through-via so that the through-via only partially fills the common closed cavity,
• wherein intermediate spaces are located between the through-via and inner walls of the common closed cavity, the intermediate spaces being filled with a gaseous medium,
• wherein the first insulation layer and the second insulation layer comprise SiO2,
• wherein the first insulation layer and the second insulation layer form a common interface, the common interface being free of a connecting material, and
• wherein side surfaces of the through-via have a positive curvature in some areas and a negative curvature in other areas.