To assess migration-induced demolition modes through accelerated aging of perovskite solar cells, an international research team investigated with the help of electric forward bias and dark storage approach.
An international team of researchers led by Helmholtz-Zentrum Berlin Für Materialien und Energie (HZB) in Germany investigated the combining of continuous electric bias with dark storage as an accelerated aging test for perovskite solar cells. The aim was to assess migration-induced demolition modes by ions, which are those defects that occur during extensive Buitenveld tests.
The work opens space for “care optimism that we may be able to use electrical bias for aging” and quality assurance tests for Perovskite PV, according to Mark Khenkin, corresponding author of the research.
“Because perovskites can break down differently than the more mature PV technologies, they must reconsider the tests of the tests that we perform. Here we have demonstrated that an aging protocol consisting of the application of electric bias and resting phases, both in the dark, can capture certain outdoor relevant breakdown modies in Perovskin,” Teted-Solarcellen, “Tettled-Solarcellen,” Tettled-Solarcellen, “Tettled-Solarcellen,” Tettled-Solarcellen, “Tettled-Solarcellen,” Tells-Solarcellen, “Benkin,” Benkin, “Benkin,” Benkin, “Totated Solarcellen,” Khenkin, told PV Magazine.
In the study, the scientists of Glass Glass Perovskiet devices under long-term forward bias at three stress levels in the dark. They saw a rapid demolition when the tension exercised slightly above the cell was open circuit voltage of 1.2 V. “To record the full dynamics of the induced demolition symptoms, we followed the 1.2 V forward bias phase with a resting phase after the bias, where stress is removed, and the cells are stored in the dark,” the researchers said.
During the aging of forward bias, the team noted that ion migration led to impeded cargo transport, macroscopic defective growth and a detrimental response of the cells on a short light weeks, all of whom recovered in the rest phase after the bias, but resulted in an elevated recombination as a result of redistribution of Ionen.
When it compared this dynamic with the results of outside tests of Perovskiet solar cells for a period of 20 months in Berlin, Germany, similar patterns were observed. Periods of higher temperature and irradiation during the spring, are reportedly tailored to the forward bias phase and cooler, dimmer periods in the autumn winter tailored to the rest phase after the Bias.
“This indicates that dynamic ion migration is not only controlled by day cycles, but also by seasonal variations,” said the researchers who claim that the method offers a “single-stress, no-light approach to simulate dynamic ion migration-induced breakdown outshek.”
Because mass tests of industrial perovskiet modules under continuous lighting would be expensive, the proposed accelerated aging approach could be a potentially cheap alternative to high transit to check resilience against dynamic ion migration-induced breakdown modes.
“For the laboratories that work with small prototype cells, it is relatively easy to perform aging experiments under lighting,” Khenkin explained, and added that to capture outdoor effects on such devices will make typical use of laboratories
“But on the full PV module, relieving the device for many hundreds of hours is an expensive option that is rarely available. Electric bias in the dark would be by far a simpler and cheaper approach, if it turns out to be universal and sufficient,” he said.
The team intends to continue the research of stability and reliability assessment routines to see, for example, how universal they are on different device designs, or or or other degradation mechanisms can be forced by this type of test.
The research consortium included scientists from Helmholtz-Zentrum Berlin Für Materialien und Energie, Hochschule für Technik und Wirtschaft Berlin (HTW Berlin), Bielefeld University, University of Ljubljana, Ben-Gurion National Solar Energy Center, Ben-Gurion University of the Negev and Université Grenoble Alpes.
Their research was detailed in “Magiculating outdoor-ionmigration in perovskite solar cells: a forward bias, no-light accelerated aging approach‘Published by ACS Energy Letters. The study was also recognized in one Research highlight published IN Nature Energy.
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