Excellent Long-Term Stability of Power Conversion Efficiency in Non-Fullerene-Based Polymer Solar Cells Bearing Tricyanovinylene-Functionalized n-Type Small Molecules

Eun Yi Ko, Gi Eun Park, Ji Hyung Lee, Hyung Jong Kim, Dae Hee Lee, Hyungju Ahn, Mohammad Afsar Uddin, Han Young Woo, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

New small molecules having modified acceptor strength and π-conjugation length and containing dicyanovinylene (DCV) and tricyanovinylene (TCV) as a strongly electron-accepting unit with indacenodithiophene, IDT(DCV)2, IDT(TCV)2, and IDTT(TCV)2, were synthesized and studied in terms of their applicability to polymer solar cells with PTB7-Th as an electron-donating polymer. Intriguingly, the blended films containing IDT(TCV)2 and IDTT(TCV)2 exhibited superior shelf life stabilities of more than 1000 h without any reduction in the initial power conversion efficiency. The low-lying lowest unoccupied molecular orbital energy levels and robust internal morphologies of small TCV-containing molecules could afford excellent shelf life stability.

Original languageEnglish
Pages (from-to)8838-8847
Number of pages10
JournalACS Applied Materials and Interfaces
Volume9
Issue number10
DOIs
Publication statusPublished - 2017 Mar 15

Keywords

  • bulk heterojunction organic solar cell
  • n-type small molecules
  • non-fullerene solar cell
  • stability
  • tricyanovinylene

ASJC Scopus subject areas

  • Materials Science(all)

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