Solar cell unit

A solar cell unit comprising:

• a semiconductor body formed as a solar cell and having a front side with a first electrical connection and a back side with a second electrical connection and a side surface formed between the front side and the back side;
• a substrate with a top side and a bottom side, the substrate on the top side has a first conductive trace region formed as part of the substrate, the first electrical connection being electrically connected to the first conductive trace region, and the substrate on the top side has a second conductive trace regionconfigured as part of the substrate, the second electrical connection being electrically connected to the second conductive trace region;
• and
• a secondary optical element that has a bottom side, the secondary optical element guiding light to the front side of the semiconductor body, the secondary optical element having a planar surface on an entire bottom side,
• wherein a part of the planar surface is arranged above the front side of the semiconductor body,
• wherein a part of the bottom side of the secondary optical element has a first adhesion-promoting layer connected by material bonding to the bottom side and a polymer adhesive layer formed at least between the first adhesion-promoting layer and the front side of the semiconductor body,
• wherein the first electrical connection is connected to the first conductive trace region via a number of connectors, and
• wherein the secondary optical element is arranged above the plurality of connectors and covers the plurality of connectors.