NOVELTY - Manufacturing at least one electrically contactable grids (12) on at least one surface of a semiconductor substrate involves depositing a heat-sensitive masking agent layer on the surface of the substrate of the solar cell product; locally heating the masking agent layer to form a grid mask; removing selected parts of the masking agent layer defined by local heating to form openings in the grid mask; and applying contact metallization on the grid mask.    USE - For manufacturing at least one electrically contactable grid on surface of semiconductor substrate, which is useful in a solar cell product (claimed).    ADVANTAGE - The method provides contactable grid having double current densities enabling to trim the wire width by 25% and reduces some light shadowing. The enhanced method to produce an electrically contactable grid are cost-competitive to common processes and is substitute for conventional screen printing processes, which are expensive and consume large amounts of material. The contact grid size is reduced compared to screen printing techniques, resulting in a reduction of shadowing effects and in the enhancement of the efficiency of the solar cell. The trimming ability of the grid mask permits optimization of the current density of grid wiring of a solar cell and reduces shadowing. An additional firing is usually not needed, resulting in less degradation throughout the manufacturing process.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a solar cell product comprising a semiconductor substrate; and an electrically contactable grid on at least one side of the substrate, where the electrically contactable grid is adapted to formation by depositing a heat-sensitive masking agent layer on a surface of the substrate, locally heating the masking agent layer to form a grid mask, removing selected parts of the masking agent layer defined by local heating to form openings in the grid mask, and applying contact metallization on the grid mask.    DESCRIPTION OF DRAWING(S) - The figure shows diagram of solar cell product.    Solar cell (10)    Electrically contactable grid (12)    Photoactive substrate surface (40a)    Contact gird width (50)