Patent ID: 7851696

Claim:
A solar cell comprising: a planar semiconductor substrate with a front and a back; a multitude of holes that interconnect the front and the back; and current-collecting electrical contacts that are exclusively arranged on the back; wherein the front comprises doping of a first type; the interior wall of the holes comprises doping of the first type or metallization; the back comprises first regions that comprise the holes and that comprise doping of the first type, as well as second regions that comprise doping of a second type; the current-collecting electrical contacts comprise first contacts that contact the first regions of the back, and second contacts that contact the second regions of the back; the front comprises highly doped regions of the first type and lightly doped regions of the first type in such a way that in each case the holes are situated in a highly doped region or adjoin such a region, and the front of the planar semiconductor substrate comprises at least one region without holes, whereby the highly doped regions of the front comprise one or several regions that extend to the at least one region without holes.