For producing a photovoltaic module (1), the front electrode layer (3), the semi-conductor layer (4) and the back electrode layer (5) are patterned by separating lines (6, 7, 8) to form series-connected cells (C1, C2, . . . Cn, Cn+1) with a laser (14) emitting infrared radiation. During patterning of the semiconductor layer (4) and the back electrode layer (5) the power of the laser (14) is so reduced that the front electrode layer (3) is not damaged.