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Comparison of the Morphology Development of Polymer–Fullerene and Polymer–Polymer Solar Cells during Solution-Shearing Blade Coating

  • Author(s): Gu, X
  • Yan, H
  • Kurosawa, T
  • Schroeder, BC
  • Gu, KL
  • Zhou, Y
  • To, JWF
  • Oosterhout, SD
  • Savikhin, V
  • Molina-Lopez, F
  • Tassone, CJ
  • Mannsfeld, SCB
  • Wang, C
  • Toney, MF
  • Bao, Z
  • et al.
Abstract

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim In this work, the detailed morphology studies of polymer poly(3-hexylthiophene-2,5-diyl) (P3HT):fullerene(PCBM) and polymer(P3HT):polymer naphthalene diimide thiophene (PNDIT) solar cell are presented to understand the challenge for getting high performance all-polymer solar cells. The in situ X-ray scattering and optical interferometry and ex situ hard and soft X-ray scattering and imaging techniques are used to characterize the bulk heterojunction (BHJ) ink during drying and in dried state. The crystallization of P3HT polymers in P3HT:PCBM bulk heterojunction shows very different behavior compared to that of P3HT:PNDIT BHJ due to different mobilities of P3HT in the donor:acceptor glass. Supplemented by the ex situ grazing incidence X-ray diffraction and soft X-ray scattering, PNDIT has a lower tendency to form a mixed phase with P3HT than PCBM, which may be the key to inhibit the donor polymer crystallization process, thus creating preferred small phase separation between the donor and acceptor polymer.

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