METHOD FOR PRODUCING STRUCTURED CONTACTS, WHICH ARE ARRANGED ON ONE SIDE, IN A LAYER ARRANGEMENT FOR A PHOTOVOLTAIC COMPONENT

摘要

The invention relates to a method, wherein a doped silicon-rich layer that is nanocrystalline or amorphous is used as a first doped semiconductor layer of a first conductivity type and/or as a second doped semiconductor layer having the opposite conductivity type. Two masking layers having materials of different selective etchability are applied for the masking layer arrangement, wherein the masking layer arranged closest to the substrate is a silicon-poor layer having greater etchability in HF-containing etchant than the second masking layer, which is silicon-rich and can be etched in Si-etching etchant. The etching of the structured masking layer arrangement is performed in a silicon-etching solution in at least one etching step at least in order to remove the first doped silicon-rich layer in the contact openings and in order to remove the Si-rich masking layer in the unstructured regions of the masking layer arrangement, wherein at the same time the remaining exposed surface of the Si-poor masking layer is roughened, and the at least partial removal of the still remaining silicon-poor masking layer and of the second doped silicon-rich layer arranged on the rough surface of said silicon-poor masking layer is performed by means of a lift-off process in an HF-containing solution in order to expose the structured first silicon-rich layer. The same result is achieved by using only one masking layer having a silicon gradient.