Isoindigo-based polymer solar cells with high open circuit voltages up to 1.01 v

Gi Eun Park, Suna Choi, Jicheol Shin, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Isoindigo-based copolymers containing non-fluorinated (PIIDBT) and fluorinated bithiophene moieties (PIIDFBT) were synthesized. The replacement of hydrogen atoms with electronegative fluorine atom attained the intramolecular noncovalent interactions in conjugated polymer structure employing the concept of conformational locks. Furthermore, the fluorine characteristics as substituent atoms tuned the electron withdrawing ability and made the HOMO energy levels of fluorinated moieties deeper (-5.79 eV) than that of non-fluorinated polymer (-5.54 eV). As a result, the photovoltaic performance of PIIDFBT was improved by increasing its open circuit voltage (Voc) up to 1.01 V, resulting in a power conversion efficiency of 6.21%. The PIIDFBT with high Voc can be recognized as a promising candidate for both single junction and multi-junction photovoltaics.

Original languageEnglish
Pages (from-to)157-163
Number of pages7
JournalOrganic Electronics
Publication statusPublished - 2016 Jul 1

Bibliographical note

Funding Information:
The authors acknowledge the financial support from the National Research Foundation of Korea ( NRF2012R1A2A1A01008797 ) and from Key Research Institute Program ( NRF20100020209 ).


  • Fluorinated moiety
  • Isoindigo
  • Open circuit voltage
  • Polymer solar cells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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