Solution-processed antireflective coating for back-contact perovskite solar cells

Dorota M. Bacal, Niraj N. Lal, Askhat N. Jumabekov, Qicheng Hou, Yinghong Hu, Jianfeng Lu, Anthony S.R. Chesman, Udo Bach

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)


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 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.

Original languageEnglish
Pages (from-to)12650-12660
Number of pages11
JournalOptics Express
Issue number9
Publication statusPublished - 27 Apr 2020

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