Rational design of π-bridges for ambipolar DPP-RH-based small molecules in organic photovoltaic cells

Yoonho Eom, Chang Eun Song, Won Suk Shin, Sang Kyu Lee, Eunhee Lim

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We report the synthesis of a series of A1–π–A2–π–A1-type small molecules, DPP2T-RH, DPPFT-RH, and DPPT-RH, in which thiophene and furan were introduced to bridge the two strong electron-withdrawing units of DPP and rhodanine (RH). Interestingly, these DPP-RH-based small molecules exhibited ambipolar characteristics, showing photovoltaic performance both as donors and acceptors in combination with PC71BM and P3HT, respectively. The best power conversion efficiencies were obtained from DPPFT-RH (1.77%) and DPP2T-RH (1.28%) as donor and acceptor, respectively. Their physical properties, film packing ability, and photovoltaic performances were fine-tuned by rational design of the π-bridges.

Original languageEnglish
Pages (from-to)338-348
Number of pages11
JournalJournal of Industrial and Engineering Chemistry
Volume45
DOIs
StatePublished - 25 Jan 2017

Keywords

  • Acceptor
  • Diketopyrrolopyrrole (DPP)
  • Organic photovoltaic cell (OPV)
  • Organic solar cell
  • Thiophene

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