KIT achieves 18 percent efficiency with perovskite solar module

Researchers at the German Karlsruhe Institute of Technology (KIT) have produced perovskite solar modules with almost no scaling losses. They combined serial interconnection by laser with vacuum processing of all layers of the solar cell. With the combination of vacuum processing and laser ablation, the researchers at KIT's Light Technology Institute (LTI) achieved efficiencies of up to 16.6 percent on a component area of more than 50 square centimeters and of 18 percent on an area of four square centimeters - according to KIT, »world record for vacuum-processed perovskite solar modules.«
In photovoltaics, perovskite semiconductors »are considered to be particularly promising materials for the future, thanks to their low-cost availability, their ease of manufacture, and their enormous efficiency potential,« according to the scientists. Manufactured in the laboratory, the cells now achieve efficiencies of more than 25 percent.
»A key challenge is to transfer the efficiencies achieved on surfaces of a few square millimeters to typical solar module surfaces of several hundred square centimeters,« says Tobias Abzieher, who heads the development of vacuum-deposited perovskite solar cells at the LTI. In the case of perovskite solar modules, upscaling has so far led to significant losses in efficiency. On the one hand, the larger the areas, the more difficult it is to deposit the individual solar cell layers, and on the other hand, the series connection results in so-called dead areas between the active solar cell strips. These are areas that could not contribute to power generation later on, but would be needed for the series connection, according to the Karlsruhe team, which minimized the influence of both loss mechanisms by vapor-depositing all layers of the solar modules in a vacuum. The result is »an important step from the laboratory to industry.«
In the future, the researchers plan to work on optimizing the pure solar cell layer stack as well as further reducing dead areas. »If we fully exploit the potential of the technology, the production of perovskite solar modules with efficiencies of significantly more than 20 percent even on even larger areas is a goal that can be realized in the near future,« says Ulrich W. Paetzold, head of the cross-institutional Taskforce Perovskite Photovoltaics at KIT. The research in the department »Next Generation Photovoltaics« at the Institute of Microstructure Technology (IMT) and at the LTI of KIT is supported by the German Federal Ministry for Economic Affairs and Energy in the joint project CAPITANO and within the EU Framework Program for Research and Innovation Horizon 2020.

Related News