Tricyanofuran-based donoracceptor type chromophores for bulk heterojunction organic solar cells

Min Ju Cho, Jangwon Seo, Heong Sub Oh, Hongsub Jee, Won Jin Kim, Kyung Hwan Kim, Mai Ha Hoang, Dong Hoon Choi, Paras N. Prasad

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Tricyanofuran-based small molecules were synthesized through Knoevenagel reaction with formyl heteroaromatic donating moieties and 2-cyanomethylene-3- cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF) as a strong acceptor. UVvis absorption demonstrated that the combination of TCF with donating units resulted in an enhanced intra-molecular charge transfer (ICT) transition, which led to long wavelength absorption in the chromophores. The absorption coefficients and the molecular energy levels of the chromophores can be tuned effectively by employing different donating groups. The chromophores were used in conjunction with [6,6]-phenyl C61 butyric acid methyl ester (PC 61BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC 71BM) to fabricate organic heterojunction photovoltaic cells. This solution-processed bulk heterojunction (BHJ) solar cells exhibited a power conversion efficiency (PCE) of 2.44%, a short-circuit current density (J SC) of 8.74 mA/cm 2, and an open-circuit voltage (V OC) of 0.93 V under simulated air mass 1.5 global irradiation (100 mW/cm 2).

Original languageEnglish
Pages (from-to)71-77
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume98
DOIs
Publication statusPublished - 2012 Mar

Keywords

  • Bulk heterojunction
  • Chromophore
  • Organic solar cells
  • PCBM
  • Solution process

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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