SOLAR CELL AND A METHOD FOR PRODUCING A SOLAR CELL WITH OXIDISED INTERMEDIATE REGIONS BETWEEN POLYSILICON CONTACTS

摘要

The invention relates to a method for producing a solar cell (1), comprising the steps of: (a) providing a silicon substrate (3); (b) producing a boundary surface dielectric layer (5) on a surface of the silicon substrate (3); (c) depositing a silicon layer (7) consisting of amorphous or polycrystalline silicon onto said boundary surface dielectric layer (5), wherein the silicon layer (7) comprises laterally adjoining p-type doped regions (9) and n-type doped regions (11); (d) oxidising the silicon layer (7) in a locally delimited manner in intermediate regions (19) between adjoining p-type doped regions (9) and n-type doped regions (11); and (e) producing p-contacts (31) in contact with the p-type doped regions (9) of the silicon layer (7), and n-contacts (33) in contact with the n-type doped regions (11) of the silicon layer (7). Said locally-delimited oxidation allows the adjoining p-type doped regions (9) and n-type doped regions (11) to be electrically separated from one another, while simultaneously obtaining a good degree of passivation.