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. 2017 Jan 16;8:14068. doi: 10.1038/ncomms14068

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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A set of 2D AFM phase images, pair-correlation functions (g(r)), and 2D FFT profiles for the b- and q-OPVs with varying annealing durations at 65 °C: (a–c) b-OPV for 1 day, (d–f) b-OPV for 30 days, (g–i) q-OPV for 1 day and (j–l) q-OPV for 30 days. For the AFM data, colour bars denote the normalized orientational angle deviation and the scan area was 5 × 5 μm² (scale bars, 2 μm). The error ranges corresponding to the s.d. in b,e,h,k were obtained from AFM analysis of five samples.