Solar cell unit constructed with - a semiconductor body, which is constructed as a solar cell and which has a front side with a first electrical connection and a rear side with a second electrical connection and a side surface formed between the front side and the rear side, and - a support with an upper side and a lower side, wherein the support has on the upper side a first conductor track region, which is formed as part of the support, the first electrical connection being electrically connected with the first conductor track region, and the support has on the upper side a second conductor track region, which is formed as part of the support, the second electrical connection being electrically connected with the second conductor track region, - a secondary optical element which has a lower side, wherein the secondary optical element conducts light to the front side of the semiconductor body, - the secondary optical element has a planar surface at the entire lower side and - a part of the planar surface is arranged above the front side of the semiconductor body, characterised in that - a part of the lower side comprises an adhesion-promoting layer, which is connected by material couple with the lower side, and a polymer adhesive layer is formed at least between the first adhesion-promoting layer and the front side of the semiconductor body and without limitation or lateral expansion, - the polymer adhesive layer is formed as a cast mass at the entire lower side of the secondary optical element and covers in shape-locking manner the front side of the semiconductor body and the side surfaces of the semiconductor body, - the polymer adhesive layer is formed to be pillow shaped, - the secondary optical element has an ellipsoidal form or is constructed in the form of a half ellipsoid, and - the secondary optical element is formed integrally from an inorganic material. - a semiconductor body, which is constructed as a solar cell and which has a front side with a first electrical connection and a rear side with a second electrical connection and a side surface formed between the front side and the rear side, and - a support with an upper side and a lower side, wherein the support has on the upper side a first conductor track region, which is formed as part of the support, the first electrical connection being electrically connected with the first conductor track region, and the support has on the upper side a second conductor track region, which is formed as part of the support, the second electrical connection being electrically connected with the second conductor track region, - a secondary optical element which has a lower side, wherein the secondary optical element conducts light to the front side of the semiconductor body, - the secondary optical element has a planar surface at the entire lower side and - a part of the planar surface is arranged above the front side of the semiconductor body, characterised in that - a part of the lower side comprises an adhesion-promoting layer, which is connected by material couple with the lower side, and a polymer adhesive layer is formed at least between the first adhesion-promoting layer and the front side of the semiconductor body and without limitation or lateral expansion, - the polymer adhesive layer is formed as a cast mass at the entire lower side of the secondary optical element and covers in shape-locking manner the front side of the semiconductor body and the side surfaces of the semiconductor body, - the polymer adhesive layer is formed to be pillow shaped, - the secondary optical element has an ellipsoidal form or is constructed in the form of a half ellipsoid, and - the secondary optical element is formed integrally from an inorganic material.