| 摘要 |
<p>Back contact solar cells do not have shadow losses. However, the required structuring measures impair the bounding surface of the absorber layer, which must be well passivated, in the case of homojunctions. The solar cell (01) according to the invention has only heterojunctions (14, 17). The doped absorber layer (02) is well passivated by an intrinsically conductive passivation layer (15) covering the entire surface and completely unstructured. A contact grid (08), an insulating grid (09) congruent therewith, an emitter layer (07), and a contact surface (13) are arranged on the intrinsically conductive passivation layer (15). In order to support the discharge of charge carriers, the intrinsically conductive passivation layer (15) is made of a material having a high surface charge opposed to the doping of the absorber layer (02). Furthermore, a supporting potential barrier between the intrinsically conductive passivation layer (15) and the contact grid (08) and a sufficient overlap width (L) in the sense of an overlap of the contact elements (11) of the contact grid (08) with insulation elements (18) of the insulation grid (09) are provided in order to avoid internal cell short circuits. Because the absorber layer (02) is completely unstructured, and because of the exclusive heterojunctions (14, 17) thereof, a high efficiency can be obtained in the generation of electricity.</p> |
