Bacal, Dorota M.Lal, Niraj N.Jumabekov, Askhat N.Hou, QichengHu, YinghongLu, JianfengChesman, Anthony S.R.Bach, Udo2025-03-152025-03-15researchoutputwizard:a383154xPUB13117Scopus:85084625398WOS:WOS:000530854700013https://dspace-test.anu.edu.au/handle/1885/733717142Back-contact architectures for perovskite solar cells eliminate parasitic-absorption losses caused by the electrode and charge collection layers but increase surface reflection due to the high refractive index mismatch at the air/perovskite interface. To mitigate this, a ∼85 nm thick layer of poly(methyl methacrylate) (PMMA), with a refractive index between those of air and perovskite, has been applied as an antireflective coating. Transfer matrix modelling is used to determine the ideal PMMA layer thickness, with UV-Vis spectroscopy measurements used to confirm the increase in absorption that arises through the application of the antireflective coating. The deposition of a thin film of PMMA via spin coating onto a solar cell results in a 20–30% relative increase in short circuit current density and stable power output density.Australian Research Council (CE170100026, DP160104575); Australian Centre for Advanced Photovoltaics; Australian Renewable Energy Agency; Commonwealth Scientific and Industrial Research Organisation.11EnglishPublisher Copyright: © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement2020-04-2710.1364/OE.384039http://www.scopus.com/inward/record.url?scp=85084625398&partnerID=8YFLogxK