Tuning Side Chain and Main Chain Order in a Prototypical Donor–Acceptor Copolymer: Implications for Optical, Electronic, and Photovoltaic Characteristics

  • Marcel Schubert
  • Johannes Frisch
  • Sybille Allard
  • Eduard Preis
  • Ullrich Scherf
  • Norbert Koch
  • Dieter Neher
Chapter
Part of the Advances in Polymer Science book series (POLYMER, volume 272)

Abstract

The recent development of donor–acceptor copolymers has led to an enormous improvement in the performance of organic solar cells and organic field-effect transistors. Here we describe the synthesis, detailed characterisation, and application of a series of structurally modified copolymers to investigate fundamental structure–property relationships in this class of conjugated polymers. The interplay between chemical structure and optoelectronic properties is investigated. These are further correlated to the charge transport and solar cell performance, which allows us to link their chemical structure to the observed physical properties.

Keywords

Aggregate states All‐polymer heterojunctions Alternating copolymers Ambipolar charge transport Ambipolar materials Backbone modifications Bilayer solar cells Charge separation Conformational disorder Crystalline phases Donor–acceptor copolymers Electron traps Energetic disorder Energy‐level alignment Fermi‐level alignment Fermi‐level pinning Interface dipole Interlayer Intrachain order Intragap states Microscopic morphology Mobility imbalance Mobility relaxation Monte Carlo simulation Multiple trapping model Nonradiative recombination OFET Open‐circuit voltage Optoelectronic properties Partially alternating copolymers Photo‐CELIV Photocurrent Photovoltaic gap Polymer intermixing Recombination losses Spectral diffusion Statistical copolymers Stille‐type cross‐coupling Structure–property relationships Time‐dependent mobility Time‐of‐flight (TOF) Transient photocurrent Ultraviolet photoelectron spectroscopy Vacuum‐level alignment X‐ray photoelectron spectroscopy 

Notes

Acknowledgment

The authors thank the DFG for funding within the DFG Priority Program 1355 “Elementary Processes of Organic Photovoltaics.” This report is based on results obtained by the collaboration of project no. 15 (“Tuning the Optical and Charge-Transporting Properties of the Electron-Accepting Phase in Polymer Solar Cells”) and project number 11 (“Electronic Properties of Interfaces with Conjugated Polymers and Polyelectrolytes”).

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Marcel Schubert
    • 1
  • Johannes Frisch
    • 2
  • Sybille Allard
    • 3
  • Eduard Preis
    • 3
  • Ullrich Scherf
    • 3
  • Norbert Koch
    • 2
    • 4
  • Dieter Neher
    • 5
  1. 1.Soft Matter Photonics, School of Physics and Astronomy, University of St AndrewsSt AndrewsUK
  2. 2.Institut für Physik and IRIS Adlershof, Humboldt-Universität zu BerlinBerlinGermany
  3. 3.Macromolecular Chemistry and Institute for Polymer Technology, Bergische Universität WuppertalWuppertalGermany
  4. 4.Helmholtz Zentrum Berlin für Materialien und Energie GmbHBerlinGermany
  5. 5.Physics of Soft Matter, School of Physics and Astronomy, University of PotsdamPotsdamGermany

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