Semitransparent thin-film solar module

A method for producing a thin-film solar module, comprising:

• providing a substrate, wherein the substrate is flat;
• depositing a rear electrode layer on one side of the substrate;
• depositing an absorber layer over the rear electrode layer;
• depositing a front electrode layer over the absorber layer;
• patterning the rear electrode layer by first patterning lines;
• patterning the absorber layer by second patterning lines;
• patterning the front electrode layer by third patterning lines, wherein a patterning zone is formed by an immediate sequence of a first patterning line, a second patterning line, and a third patterning line, and the patterning zone form a monolithic serial connection circuit of solar cells;
• forming one or more rear-electrode-layer-free optically transparent zones by section-wise removal of at least the rear electrode layer in a reduced zone region reduced by the first patterning line of at least one patterning zone, causing the rear electrode layer to be continuous in the reduced zone region;
• depositing a buffer layer over the absorber layer;
• and
• patterning the buffer layer by fourth patterning lines,
• wherein the one or more optically transparent zones is filled by material of the buffer layer, and
• wherein the buffer layer is in direct contact with the rear electrode layer.