Alkoxy-functionalized thienyl-vinylene polymers for field-effect transistors and all-polymer solar cells

Hui Huang, Nanjia Zhou, Rocio Ponce Ortiz, Zhihua Chen, Stephen Loser, Shiming Zhang, Xugang Guo, Juan Casado, J. Teodomiro Lõpez Navarrete, Xinge Yu, Antonio Facchetti*, Tobin J. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

π-conjugated polymers based on the electron-neutral alkoxy- functionalized thienyl-vinylene (TVTOEt) building-block co-polymerized, with either BDT (benzodithiophene) or T2 (dithiophene) donor blocks, or NDI (naphthalenediimide) as an acceptor block, are synthesized and characterized. The effect of BDT and NDI substituents (alkyl vs alkoxy or linear vs branched) on the polymer performance in organic thin film transistors (OTFTs) and all-polymer organic photovoltaic (OPV) cells is reported. Co-monomer selection and backbone functionalization substantially modifies the polymer MO energies, thin film morphology, and charge transport properties, as indicated by electrochemistry, optical spectroscopy, X-ray diffraction, AFM, DFT calculations, and TFT response. When polymer P7 is used as an OPV acceptor with PTB7 as a donor, the corresponding blend yields TFTs with ambipolar mobilities of μe = 5.1 × 10-3 cm2 V-1 s-1 and μh = 3.9 × 10-3 cm2 V-1 s-1 in ambient, among the highest mobilities reported to date for all-polymer bulk heterojunction TFTs, and all-polymer solar cells with a power conversion efficiency (PCE) of 1.70%, the highest reported PCE to date for an NDI-polymer acceptor system. The stable transport characteristics in ambient and promising solar cell performance make NDI-type materials promising acceptors for all-polymer solar cell applications.

Original languageEnglish (US)
Pages (from-to)2782-2793
Number of pages12
JournalAdvanced Functional Materials
Volume24
Issue number19
DOIs
StatePublished - May 21 2014

Keywords

  • O···S interaction
  • all-polymer solar cells
  • conjugated polymers
  • thin film transistors

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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