A process for producing a solar cell

A method for manufacturing a solar cell, a means of a first dopant in the entire substrate surface of a semiconductor substrate, in particular including edges emitter region produced and a base contact region generated by over-compensating second dopant and a depth of the emitter region penetrating separation trench for electrical separation of the emitter region of comprises the base contact region, to form the isolation trench structure, a mask layer by means of a laser-based local ablation to the sketch of the separation trench, and is etched with the patterned mask, the isolation trench in the emitter region surface.