METHOD FOR PRODUCING MONOCRYSTALLINE SOLAR CELLS WITH A BACK SURFACE CONTACT STRUCTURE

摘要

The invention relates to a method for producing monocrystalline solar cells with a back surface contact structure and a plurality of partial cell diodes that are approximately equal in area and have local pn junctions connected in series to obtain an increased starting voltage. A crack is created between neighbouring partial cell diodes in a strip-shaped region that can be devoid of doping and the partial cell diodes are connected in series by bridges of soldered or bonded metal strips. According to the invention, the wafer is integrally bonded on one side to an expansion plate after a known cell processing method. The insulation crack is then created from the side of the wafer lying opposite the expansion plate. The expansion plate is heated with the wafer. An insulating material is introduced into the crack or gap that extends as a result of the expansion to obtain a permanent electrical insulation.