Photovoltaic solar cell and method for producing a photovoltaic solar cell

Abstract

The invention relates to a method for producing a photovoltaic solar cell having a front side designed for coupling in light, comprising the following method steps: A Producing a plurality of cutouts in a semiconductor substrate of a base doping type, B Producing one or more emitter regions of an emitter doping type at least at the front side of the semiconductor substrate, wherein the emitter doping type is opposite to the base doping type, C Applying an electrically insulating insulation layer and D Producing metallic feed through structures in the cutouts, at least one metallic base contact structure at the rear side of the solar cell, which is formed in an electrically conductive manner with the semiconductor substrate in a base doping region, at least one metallic front-side contact structure at the front side of the solar cell, which is formed in an electrically conductive manner with the emitter region at the front side of the semiconductor substrate, and at least one rear-side contact structure at the rear side of the solar cell, which is formed in a manner electrically conductively connected to the feed through contact structure. The invention is characterized in that in method step B and / or a further method step in addition a feed through emitter region of the emitter doping type extending from the front side to the rear side is formed in each case in the semiconductor substrate on the walls of the cutouts, in that in method step C the insulation layer is applied in a manner covering the rear side of the semiconductor substrate, if appropriate further intervening intermediate layers, in that in method step D the rear-side contact structure is applied to the insulation layer, if appropriate to further intermediate layers, in such a way that the rear-side contact structure extends to regions of the semiconductor substrate having base doping and, in these regions, on account of the intervening insulation layer, an electrical insulation is formed between rear-side contact structure and semiconductor substrate, and the base contact structure is applied to the insulation layer, if appropriate to further intermediate layers, in such a way that the base contact structure penetrates through the insulation layer at least in regions, such that an electrically conductive connection is produced between base contact structure and semiconductor substrate. The invention furthermore relates to a photovoltaic solar cell.

Description

technical field [0001] The invention relates to a photovoltaic solar cell according to the preamble of claim 13 and to a method of manufacturing a photovoltaic solar cell according to the preamble of claim 1 . Background technique [0002] Photovoltaic solar cells generally consist of a semiconductor structure having a base region and an emitter region, wherein the semiconductor structure is generally mainly formed from a semiconductor substrate, for example a silicon substrate. In semiconductor structures, light is usually coupled over the front side of the solar cell, whereby the generation of electron-hole pairs occurs after the coupled light has been absorbed into the solar cell. A PN junction is formed between the base and emitter regions on which the generated charge carrier pairs are separated. Furthermore, the solar cell includes a metallic emitter contact and a metallic base contact, which are each electrically conductively connected to the emitter or the base. Ch...

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Problems solved by technology

[0008] However this requires an expensive process and requires multiple costly masking steps

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