A research team led by the Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE) of Germany and the King Abdullah University of Science and Technology (Kaust) in Saudi-Arabia has a perovskiet-Silicon Tandem Solar Cell manufactured with the help of a two-piece perovskite-deposes Industry stars.
The researchers explained that the novelty of their new tandem device is the high-quality surface passion of the Perovskiet top cell, which makes its combination possible with a standard silicon floor solar cell, the texturization of which is a problem for depositing the perovskiet layer.
“Until now, effective passivation has not been fully utilized on structured perovskiet silicon tandem solar cells, with rather success largely limited to flat architectures,” said the main author of the research, Ossama Er-Raji.
The silicon floor cell was made with a 250 μm thick P-doted floatzone silicon wafer and an industrial double-sided pyramid texture with a pyramid size division ranging from 1 to 4 μm on both sides, where intrinsic layers of pasi meneuze Saileuzezeuze Chemical vapor (pee guts).
The upper perovskite solar cell was based on a hole transport layer (HTL) made of a phosphonic acid called methyl substiTuted Carbazol (ME-4PACZ), a double halide perovskietbsorber, a p-fenylendiaminium iodide (PDAI) passivating layer and formamidinium challenge.
The deposit of the passivating layer was carried out by spincoating at 4000 rpm, followed by glowing at 100 C. The perovskiet surface treatment was based on 1.3 diaminopropan dihydroiodide. “We have now managed an excellent passivation by depositing 1.3 diaminopropan dihydroiodide on the uneven perovskiet surface,” said ER-RAJI.
Tested under standard lighting conditions, the tandem cell was able to reach a power-conversion efficiency of 33.1% and an open circuit voltage of 2.01 V, while also showing “extensive” outdoor stability at a test facility on the Red Sea coast.
“Surface-passion of solar cells is not only a nice function; it is an essential booster for their efficiency and stability,” said Stefan Glunz, professor of photovoltaic energy conversion at the University of Freiburg and director of the Photovoltaics Division at Fraunhofer Ise. “For today’s silicon sun cells, surface passion was the key to high efficiency in industrial production, and it is encouraging that the PV industry will benefit from these positive effects for perovskiet silicon tandem solar cells too.”
The device was presented in the newspaper “Electron accumulation over the perovskiet layer improves tandem solar cells with structured silicon“Published in Science. The group included academics from the University of Freiburg in Germany.
“The findings of the researchers build on work in the Fraunhofer Lighthouse Project Manitu as well as the projects Presto And Perle, both funded by the Federal Ministry for Economic Affairs and Energy, “said the Fraunhofer Isee.
