Multi-layer back electrode for a photovoltaic thin-film solar cell, use of the same for producing thin-film solar cells and modules, photovoltaic thin-film solar cells and modules containing the multi-layer back electrode and method for the production thereof

Abstract

The invention relates to a multi-layer back electrode for a photovoltaic thin-film solar cell, comprising, in this order, at least one bulk back electrode layer, containing or substantially consisting of V, Mn, Cr, Mo, Co, Zr, Ta, Nb and / or W and / or containing or substantially consisting of alloys containing V, Mn, Cr, Mo, Co, Zr, Fe, Ni, Al, Ta, Nb and / or W; at least one conductive barrier layer; at least one, in particular ohmic contact layer, containing or substantially consisting of Mo, W, Ta, Nb, Zr and / or Co, in particular Mo and / or W, and / or containing or substantially consisting of at least one metal chalcogenide, and / or containing at least one first layer, adjacent to the barrier layer, containing or substantially consisting of Mo, W, Ta, Nb, Zr and / or Co, in particular Mo and / or W, and at least one second layer which is non-adjacent to the barrier layer, containing or substantially consisting of at least one metal chalcogenide.

Description

technical field [0001] The invention relates to multilayer back electrodes for photovoltaic thin-film solar cells, the use of multilayer back electrodes for producing thin-film solar cells and thin-film solar modules, photovoltaic thin-film solar cells comprising a multilayer back electrode according to the invention and modules and methods for manufacturing photovoltaic thin-film solar cells and modules. Background technique [0002] Suitable photovoltaic solar cells include crystalline and amorphous silicon solar modules on the one hand and so-called thin-film solar modules on the other hand. In the latter case, IB-IIIA-VIA compound semiconductor layers, so-called chalcopyrite semiconductor absorber layers, are generally used. In these thin-film solar modules a molybdenum rear electrode layer is usually applied on a glass substrate. In a method variant, the molybdenum rear electrode layer is provided with copper and indium and optionally with a thin precursor metal layer...

AI Technical Summary

Problems solved by technology

[0004] While it is possible to achieve good efficiencies by using particularly pure back electrode materials, this is accompanied by often disproportionately high production costs

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