A thin-film solar module is made up of individual solar cells that are connected together in series. The series connection is created through the use of selective laser ablation processes. In the Laser Processes and Module Technology working group, the required laser processes, i.e. the selective ablation of front contact, absorber and back contact materials, are investigated and optimized.

Series connection minimizes electrical losses in a thin-film module and increases the output voltage generated. The quality of the laser ablation processes has a major impact on the output power of thin-film modules. It is therefore important to investigate and understand the exact processes that determine the ablation quality. An automated laser structuring system equipped with several Q-switched solid-state lasers of different wavelengths, pulse durations and beam geometries is available for researching and developing the ablation processes.

In addition to optimizing the ablation processes, new interconnection concepts are being developed that have the potential to increase the efficiency of thin-film solar modules. A further approach is to simplify the manufacturing process for series interconnection. Fast and cost-effective methods such as screen printing or ink-jet are used for this purpose.