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. 2019 Oct 25;5(10):eaaw6619. doi: 10.1126/sciadv.aaw6619

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 3 — (A) Far-field ATR-FTIR absorbance of MAPbI₃ (top) and CsFAMA (bottom) perovskite films. The main molecular absorption of MA at 1470 cm⁻¹ (symmetric NH₃⁺ stretching) is very low in CsFAMA perovskite related to the molecular ratio between MA and FA. In the CsFAMA spectrum, the main molecular absorption around 1700 cm⁻¹ is attributed to antisymmetric C-N stretching of the FA molecule. Nano-FTIR absorbance spectrum (B) and respective ATR-FTIR far-field spectrum (C) of a 370-nm-thick CsFAMA perovskite film. a.u., arbitrary units.