In recent years, generating electricity with silicon solar cells has become much cheaper. Most of the remaining costs scale with the cell area. Therefore, increasing the efficiency is an effective lever to further reduce the generating costs of photovoltaic electricity. In order to overcome the theoretical efficiency limit of pure silicon photovoltaic cells, we are developing Perovskite silicon tandem solar cells.
Perovskite solar cells can use the highly energetic blue and green light much more efficiently than silicon solar cells. On the other hand, silicon solar cells use the red and infrared light while Perovskite solar cells cannot. By combining these efficient single cells, we aim to achieve efficiencies above the so-called Auger limit of 29.4 %.
Using silicon for the bottom subcell is attractive since we can rely on an established and cost-effective production technology. The Perovskite solar cell as top cell is potentially cheap to manufacture and makes a higher efficiency possible.