METHOD FOR PRODUCING A METAL CONTACT STRUCTURE OF A PHOTOVOLTAIC SOLAR CELL

摘要

The invention relates to a method for producing a metal contact structure of a photovoltaic solar cell, comprising the following method steps: A applying an electrically non-conductive insulating layer to a surface of a semiconductor substrate, optionally to one or more intermediate layers covering said surface, B applying a metal contact layer to the insulating layer, optionally to one or more intermediate layers covering the insulating layer, and generating a plurality of local electrically conductive connections between the semiconductor substrate and the contact layer right through the insulating layer and optionally further intermediate layers. The invention is characterised in that in method step B the metal contact layer is formed by the following method steps: B1 a first paste containing metal particles is applied to a plurality of local regions, B2 a second paste containing metal particles is applied in a planar manner, covering at least the regions covered with the first paste as well as at least partially the regions located therebetween, and B3 globally heating the semiconductor substrate in a temperature step, wherein first and second pastes and the temperature step(s) following method step B1 are designed such that the first paste penetrates the insulating layer and forms an electrically conductive contact directly with the semiconductor substrate, whereas the second paste does not penetrate the insulating layer and is electrically conductively connected to the semiconductor substrate only indirectly via the first paste.