Abstract: The present invention pertains to a process for manufacturing a solar cell unit comprising the steps of (a.) providing an etchable conductive temporary substrate (b.) applying a layer of a transparent conductive oxide (TCO) onto the temporary substrate (c.) applying a photovoltaic layer onto the TCO layer (d.) applying a back electrode layer (e.) applying a permanent carrier (f.) in any one of the preceding steps providing an etch resist on the temporary substrate in a pattern suitable to form a current collection grid after removal of the portion of the temporary substrate which is not covered with etch resist (g.) selectively removing the temporary substrate where it is not covered with etch resist. The process of the present invention makes it possible to provide a solar cell unit comprising a highly conductive current collection grid by way of a simple process. If so desired, the current collection grid may be provided with a color layer.