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. 2020 Jan 28;7:946. doi: 10.3389/fchem.2019.00946

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Copyright © 2020 García-Benito, Quarti, Queloz, Hofstetter, Becker-Koch, Caprioglio, Neher, Orlandi, Cavazzini, Pozzi, Even, Nazeeruddin, Vaynzof and Grancini.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Molecular structure of the organic spacers. (B) Absorbance and (C) PDS measurements of (Lc)₂PbI₄ and (Lf)₂PbI₄. (D) Schematic effect associated to the change of optical properties going from Lc to Lf, as related to band gap (E_g) opening and decrease of the exciton binding energy. (E) XRD patters for (Lc)₂PbI₄ and (Lf)₂PbI₄ thin films. (F) Map of the band gap as function of the octahedral tilting associated to the angles β and δ (the definition of the angles is showed in the inset). (G) Dielectric profile of (Lc)₂PbI₄ and (Lf)₂PbI₄.