KIT develops technology to increase efficiency of perovskite solar cells

Scientists at the German Karlsruhe Institute of Technology (KIT) have developed a novel, highly efficient hole conductor layer made of nickel oxide (NiOx) that can be deposited over a large area and leads to record efficiencies in solar cells with organometallic perovskites. »With efficiencies of over 24 percent in the laboratory, perovskite solar cells are among the most efficient thin-film technologies in photovoltaics today,« the researchers say. Compared to the currently dominant silicon solar cells, the technology promises »significantly cheaper and simpler production«.
The team achieved efficiencies of up to 16.1 percent for completely vacuum-processed perovskite solar cells. With inkjet-printed absorber layers, the scientists achieved an efficiency record of up to 18.5 percent. »Currently, deposition by rotary coating, for which efficiencies of more than 24 percent have been achieved, dominates development. However, this can practically not be transferred to large areas,« says Tobias Abzieher, PhD student at KIT's Light Technology Institute (LTI).
In addition to the KIT, the Innovation Lab in Heidelberg is also involved in the project. The research was supported by the German Federal Ministry of Education and Research (BMBF), the initiation and networking funding of the Helmholtz Association and the Karlsruhe School of Optics & Photonics (KSOP).

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