METHOD FOR PRODUCING A WAFER-BASED, REAR-CONTACTED HETERO SOLAR CELLS AND HETERO SOLAR CELL PRODUCED BY THE METHOD

摘要

A method for the production of a wafer-based, back-contacted heterojunction solar cell includes providing at least one absorber wafer. Metallic contacts are deposited as at least one of point contacts and strip contacts in a predetermined distribution on a back side of the at least one absorber wafer. The contacts have steep flanks that are higher than a cumulative layer thickness of an emitter layer and an emitter contact layer and are sheathed with an insulating sheath. The emitter layer is deposited over an entire surface of the back side of the at least one absorber wafer. The emitter contact layer is deposited over an entire surface of the emitter layer so as to form an emitter contact system. At least one of the emitter layer and the emitter contact layer is selectively removed so as to expose the steep flanks of the contacts that are covered with the insulating sheath. An insulation layer is deposited over an entire surface of the emitter contact layer so as to provide a narrow contact web at an edge of the at least one absorber wafer. End areas of the steep flanks of the contacts that are covered by the insulation layer are exposed. At least one of an absorber contact layer and an absorber contact grid is deposited over an entire surface of the insulation layer and over the exposed end areas of the steep flanks so as to form the absorber contact system, so as to provide the heterojunction solar cell with the contact web and with the at least one of an absorber contact layer and an absorber contact grid of the absorber contact system.