Patent ID: 8900908

Claim:
A method for local high-doping and contacting of a semiconductor structure, representing a solar cell or a precursor of a solar cell and comprising a silicon-semiconductor substrate ( 1 ) of a base doping type, with high-doping and contacting occurring by generating several local high-doping areas of the base doping type in the semiconductor substrate ( 1 ) at a contacting side ( 1 a ) of the semiconductor substrate and applying a metallic contacting layer ( 7 ) on the contacting side ( 1 a ) or one or more intermediate layers covering the contacting side ( 1 a ) partially or entirely, in order to form electrically conductive connections between the metallic contacting layer ( 7 ) and the semiconductor substrate ( 1 ) at the high-doping areas, the method comprises the following steps: A generating a layer structure covering the contacting side ( 1 a ) of the semiconductor substrate, comprising a doping layer ( 3 ), which comprises a doping substance of the base doping type and is embodied as a layer of amorphous silicon or a layer of amorphous silicon carbide with a carbon content of less than 10 at %, and a reflective layer ( 4 ), which is embodied at least in a wavelength range from 800 nm to 1200 nm with a diffraction index n R lower than a diffraction index n HS of the semiconductor substrate, with the doping layer ( 3 ) formed in the layer sequence located closer to the contacting side ( 1 a ) than the reflective layer ( 4 ), B locally heating the layer structure and a surface of the semiconductor substrate located thereunder at several zones to form local high-doping areas, with the local heating here occurring such that at the locally heated high-doping areas locally a molten mixture develops respectively comprising at least the doping layer ( 3 ) and a section of the semiconductor substrate at the contacting side ( 1 a ) and, when the molten mixture sets, a stronger doped area ( 6 ) forms in the semiconductor substrate ( 1 ) at the contacting side ( 1 a ) by at least the doping substance of the doping layer ( 3 ), and C applying the metallic contacting layer ( 7 ) to form the electrically conductive connection between the semiconductor substrate ( 1 ) and the contacting layer ( 7 ) at the high-doping areas.