Passivating breakthrough stimulates the efficiency gain in perovskiet silicon tandem solar cells
An international team of researchers has achieved an important advance in Perovskiet Silicon Tandem solar cell technology by proving effective passivation on textured silicon floor cells, the industrial stand. Their work shows that passivation of the top cell of Perovskiet extends through the entire absorbent layer, in contrast to silicon, where it only influences the surface, so that the new efficiency potential is unlocked.
The collaboration, in which Kaust, the University of Freiburg and Fraunhofer Institute for Solar Energy Systems ISE was involved, tackled one of the biggest obstacles for tandem solar cells – reaching high -quality passivation on silicon surfaces with large pyramids to maximize light absorption. By depositing 1.3 diaminopropan dihydroiodide on the top cell of the perovskiet, the team achieved excellent passivation and produced the production of tandem devices with conversion efficiency up to 33.1 percent and an open circuit voltage of 2.01 volts.
Main author Dr. Ossama Er-Raji from Fraunhofer Isee explained that earlier success in passivation was limited to flat cells, but this work proves that structured designs can also benefit. The scientists confirmed that passivation improves conductivity and filling factor through a deep field effect that influences the entire perovsorber, rather than just the surface area.
“This realization provides a solid foundation for all future research in this area,” said Prof. Stefaan De Wolf van Kaust. “It improves our understanding of the processes that occur in the top cell, while the light converts into electricity, so that scientists can use this knowledge to develop better tandem solar cells.”
Prof. Stefan Glunz from the University of Freiburg and Fraunhofer Isee emphasized the industrial significance: “Surface-passion of solar cells is not only a fun, it is an essential booster for their efficiency and stability. For the contemporary silicon solar cells that is the high-efficiors of this, and it is the high-effici-industry of the industrial production, and it is the high-effications of industrial production, and it is of industrial production, and it is the high-effications of industrial. Photovolta industry will encourage the pere of this photovoltic industry that will also encourage the photovolta industry for the pere of this photovolt.
The research builds on earlier efforts within the Fraunhofer Lighthouse Project Manitu and the Presto and Perle projects, supported by the German Federal Ministry for Economic Affairs and Energy.
Research report:Electron accumulation over the perovskiet layer improves tandem solar cells with structured silicon
