A solar cell and method of making a solar cell having a plurality of absorbers interconnected by charge carrier selective contacts

摘要

A tandem solar cell structure is described, having the following features: (a) Monolithic construction with at least two different absorber materials (104 and 108) for photovoltaic energy conversion (b) An absorber 108 consisting of crystalline silicon (c) One located on the (d) Structure of the carrier-selective contact of a thin interfacial oxide 107 and an applied thereon amorphous, semi-crystalline or polycrystalline, consisting mainly of silicon, either p (106) or n-doped (201) layer The carrier-selective contact built up from the layers 107 and 106 or 201 ensures excellent surface passivation of the crystalline silicon absorber 108 as well as the selective extraction of a charge carrier type from the latter over the entire area. Thus, a vertical current flow is achieved, so that lateral lateral conductivity is not required in each sub-cell. By high doping of the layer 106 or 201, the formation of a tunnel contact to the adjacent layer can be achieved. The thickness and / or the doping of the layer 106 or 201 can be used to approximate the generation currents in the individual sub-cells. The temperature stability of the layers 107, 106 and 201 allows the use of subsequent production steps with temperatures 400 ° C.