Scientists at the Lithuania Kaunas University of Technology claim to have improved on the previously announced 23.26% efficiency of a perovskite-based copper indium gallium selenide (CIGS) solar cell they developed with the Helmholtz Zentrum Berlin (HZB).
The researchers claim to have hit 27.5% efficiency with one of the most recently developed monolayers used for the cell. The announcement, however, makes no mention of independent verification of the feat.
Energy materials research center the HZB had achieved 21.6% for the same thin-film CIGS perovskite cell technology, on a slightly smaller surface area in February 2017.
The Lithuanian researchers said the self-assembling material used for the cell is made of molecules based on carbazole head groups with phosphonic acid anchoring groups, and consists of 1-2nm of self-assembled monolayers deposited on the surface of the perovskite by dipping it into a diluted solution.