KTU Scientists Achieve Record 21% Efficiency in Fully Inorganic Perovskite Solar Cells
Scientists from Kaunas University of Technology (KTU) and international collaborators have made a significant breakthrough in solar cell technology. Their research, published in Nature Energy with DOI 10.1038/s41560-025-01817-6, achieved one of the highest efficiencies for fully inorganic perovskite solar cells.
The team, led by Dr. Kasparas Rakštys from KTU's Faculty of Chemistry, challenged the prevailing belief that stable 2D/3D heterostructures are hard to achieve in fully inorganic perovskites. They successfully created such structures using a novel passivation strategy involving perfluorinated 2D ammonium cations.
In collaboration with researchers from the Helmholtz-Zentrum Berlin, they developed a method called spectroscopic microellipsometry (SME) to analyse 2D materials. This improved understanding of the connection between 2D layers significantly enhanced the longevity of the solar cells. The team demonstrated stable operation for over 950 hours at 85°C under continuous light.
The solar cells' efficiency exceeded 21%, with mini-modules reaching nearly 20% efficiency. This remarkable achievement opens new possibilities in materials chemistry for developing more reliable solar technologies. The international collaboration has brought the world a step closer to widespread adoption of efficient, durable perovskite solar cells.
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