by Robert Schreiber
Berlin, Germany (SPX) Dec 04, 2025
Perovskite photo voltaic cells are below improvement as candidates for subsequent technology photovoltaic modules, however industrial use stays restricted by long run instability pushed partly by migrating ions within the absorber layer. A group from Helmholtz-Zentrum Berlin (HZB) and the College of Potsdam has now measured ion densities in 4 extensively used perovskite compounds and located substantial variations between lead and tin primarily based supplies.
Perovskite analysis over the previous decade has targeted primarily on organometallic compounds through which lead occupies the B website within the ABX3 crystal construction. Lead perovskite photo voltaic cells have achieved energy conversion efficiencies which have risen from round 4 p.c to greater than 27 p.c, however using poisonous lead and restricted machine lifetimes stay main drawbacks.
The lead cation could be changed by tin, a non poisonous component, to take away lead from the machine. Tin primarily based perovskite photo voltaic cells at the moment present decrease efficiencies than lead units, but this will mirror the early stage of analysis on tin programs slightly than a elementary restrict. Dr Artem Musiienko, who leads an HZB analysis group, notes that “In purely theoretical phrases, tin-based perovskite photo voltaic cells may even exceed the effectivity of lead-based perovskites.”
The research addresses one of many fundamental causes of instability in perovskite cells, the presence of cellular halide ions that transfer by means of the lattice, speed up materials degradation, and scale back effectivity throughout operation. Musiienko’s group, along with the Antonio Abate group at HZB and the Felix Lang group on the College of Potsdam, examined 4 consultant perovskite compositions and decided each the density of cellular ions and their migration habits.
“We discovered not solely that tin primarily based perovskites have a decrease focus of cellular ions but additionally that they intrinsically exhibit a degradation time 5 instances slower than that of lead primarily based perovskites,” says Musiienko. The tin perovskite supplies had been fabricated within the HZB Hysprint laboratory utilizing two solvent programs: one composition synthesized with dimethyl sulfoxide (DMSO) and one other produced with an alternate DMF DMI solvent. The solvent variation strategy demonstrates a path to keep away from tin oxidation linked to sturdy DMSO coordination, in step with earlier investigations reported in Chemistry of Supplies in 2022.
The measurements present that the lead primarily based perovskite had the very best cellular ion density among the many samples studied. Ion density was considerably decrease within the blended lead tin perovskite and in a tin perovskite made with the standard solvent. A significant consequence got here from the tin perovskite processed with the choice solvent: “This was actually surprising: these FASnI3 photo voltaic cells have ten instances fewer cellular ions than the Pb-based photo voltaic cells. We additionally discovered that they exhibited wonderful stability throughout operation for over 600 hours,” stories PhD researcher Shengnan Zuo from Musiienko’s group.
The work strengthens the case for expanded analysis on tin primarily based perovskites as candidates for steady, lead free skinny movie photo voltaic cells. “We’re satisfied that tin-based perovskites have monumental potential and that investigating these supplies is an excellent concept. There are possibilities to considerably enhance their effectivity and stability. This research paves the way in which for the event of revolutionary, steady thin-film photo voltaic cells with suppressed ion migration,” says Musiienko.
Associated Hyperlinks
Helmholtz-Zentrum Berlin fuer Materialien und Energie
All About Solar Energy at SolarDaily.com
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