Iii-v photovoltaic multi-junction solar cell

A stack-type III-V multijunction solar cell having an upper side and an underside the stack-type III-V multijunction solar cell comprising:

• a substrate layer formed on the underside;
• a first subcell having a first bandgap on the substrate layer or comprising the substrate layer;
• a second subcell having a second bandgap and arranged above the first subcell, the second bandgap being larger than the first bandgap;
• a tunnel diode formed between the first subcell and the second subcell;
• a finger-shaped first metallic contact region formed on the upper side, the first metallic contact region comprising at least two metal layers and having a silver layer as a main constituent;
• a second metallic contact region formed over a wide area on the underside;
• and
• an absorbent layer having a thickness of more than 5 nm and less than 750 nm formed above the silver layer and connected in a materially bonded manner to the silver layer and/or an intermediate layer formed between the silver layer and the absorbent layer to increase a heat input via the absorbent layer formed on the first contact region,
• wherein the absorbent layer and/or the intermediate layer are electrically conductive layers, and
• wherein the absorbent layer has an average absorptivity for solar radiation of more than 0.5.