Method for manufacturing interconnected solar cells and such interconnected solar cells

A method of making interconnected solar cells, comprising steps of

• a) providing a continuous layer stack (100) on a substrate (120), the layer stack comprising a top electrode layer (130), a bottom electrode layer (140) adjacent to the substrate, having a photo-voltaic active layer (150) and a barrier layer (160) adjacent to the bottom electrode layer interposed between the top and the bottom electrode layer;
• b) selectively removing the top electrode layer and the photo-voltaic layer for obtaining a first trench (210) exposing the barrier layer using a first laser beam (270) with a first wavelength;
• c) selectively removing the barrier layer and the bottom electrode layer inside the first trench for obtaining a second trench (312) exposing the substrate using a second laser beam (272) with a second wavelength, wherein the second trench and the first trench provide a separation of the continuous layer stack for forming a first solar cell (302) and a second solar cell (304), and the second trench is inside the first trench leaving a portion (314) of the barrier layer (160b) of the second solar cell inside the first trench and a portion (315) of the bottom electrode layer (140b) of the second solar cell inside the first trench;
• d) filling the first trench and the second trench with an electrical insulating member (480);
• the first wavelength being larger than a wavelength corresponding with a bandgap energy of the photo-voltaic layer.