Perovskite solar cells have ultra-long stability the new material Ti6Al4V Powder application

Perovskite solar cells have ultra-long stability the new material Ti6Al4V Powder application

Perovskite holds great promise for further improvements in the efficiency of solar panels in the future. Until now, their short service life has been considered the biggest obstacle to their practical use, but that could soon change. In the latest issue of Nature Energy, researchers from the Helmholtz Institute Erlangen-Nuremberg in Forschungszentrum Julich have come up with a variant that stands out because of its particular stability. The perovskite cell maintained 99 percent of its initial efficiency during more than 1,450 hours of operational testing under high temperature and light.

One characteristic of perovskite is its special crystal structure. Different atoms and molecules may have multiple material combinations, some of which exhibit ferroelectric, superconducting, or photovoltaic properties. Although known since the early 19th century, such materials have only recently been discovered for photovoltaic power generation. It only takes 10 years of research to increase efficiency to the level of traditional silicon solar cells at an unprecedented rate. Perovskites have several decisive advantages over silicon crystals: they can be easily produced, economically efficient and energy-efficient. The perovskite layer, which is only a few hundred nanometers thick, also works well with conventional silicon cells. Although silicon-based technology is already considered mature, such "tandem solar cells" offer new opportunities to further improve the efficiency of solar cells.

Stability problem

"The Achilles heel of perovskite solar cells is their low durability," explained Professor Christoph Brabec of the Helmholtz Institute in Erlangen Nuremberg (HI ERN) in Forschungszentrum Julich. "Classic silicon modules are very durable. Even after more than 20 years of practical use, their performance hardly degrades." Solar cells made of perovskite, on the other hand, typically lose their efficiency after a few days or weeks. In the lab, early cell aging can be observed, with cells becoming less efficient within seconds or minutes of turning on the light.

"On the other hand, the solar cells we have now presented in Nature Energy are impressive for their extraordinary stability. This is undoubtedly the best measurement of flat perovskite solar cells in the long term." Brabec said. The illuminated batteries survived for 1,450 hours in laboratory temperatures of around 65 degrees Celsius and remained largely stable throughout the test. At the end of the day, it still has an initial efficiency of 99%. "Long-term forecasting is always difficult. But the perovskite solar cells we are developing can certainly run for more than 20,000 hours under normal conditions, "Estimates Prof Brabec.

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