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. 2021 Apr 21;12:2354. doi: 10.1038/s41467-021-22528-y

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© The Author(s) 2021, corrected publication 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a Evolution of the work function measured by UPS and the spin density measured by EPR for BBL:PEI_lin films with different PEI content. b Difference UV-Vis absorption spectra of BBL:PEI_lin (50 wt%) showing the evolution of polaron absorption induced by the increased PEI content. c The corresponding difference FTIR absorption spectra of the same samples. The difference absorption spectra in b and c were obtained by subtracting the BBL spectrum from the BBL:PEI_lin spectra after normalization at 575 nm and 1370 cm⁻¹ for UV-Vis and FTIR, respectively. A similar analysis is reported in Supplementary Fig. 26 for BBL:PEI_bra.