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Hou, Qicheng
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article
A Solution Processed Antireflective Coating for Back-Contact Perovskite Solar Cells
Abstract
Back-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 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.