Molecular design and ordering effects of alkoxy aromatic donor in a DPP copolymer on OTFTs and OPVs

Myeong Jong Kim, Tae Kyu An, Seul Ong Kim, Hyojung Cha, Hyoung Nam Kim, Tan Xiofeng, Chan Eon Park, Yun Hi Kim

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Two p-type polymers, PONDPP and PTADPP were synthesized by Suzuki coupling reaction to investigate the effect of alkoxy aromatic donor units in diketopyrrolopyrrole (DPP)-based copolymers on OTFTs and OPVs. PONDPP containing dialkoxynaphthalene exhibits excellent field-effect performances, with a hole mobility of 0.324 cm2/V while PTADPP containing dialkoxyanthracene exhibits mobility of 4.5 × 10-3 cm2/V at 200 °C annealing. Bulk heterojunction type polymer solar cells based on these polymers as the electron donor materials, with PC71BM as the acceptor, showed maximum power conversion efficiency (PCE) of 0.9% for PONDPP and 1.1% for PTADPP under AM 1.5 illumination. From photophysical and structural studies, we found that naphthalene unit was introduced to the DPP unit to enhance more the molecular ordering compared to anthracene unit.

Original languageEnglish
Pages (from-to)63-71
Number of pages9
JournalMaterials Chemistry and Physics
Volume153
DOIs
StatePublished - 1 Mar 2015

Keywords

  • Electrical properties
  • Electronic materials
  • Interfaces
  • Organic compounds
  • Polymers
  • Semiconductors

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