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. <EOS>