Relating polymer chemical structure to the stability of polymer:fullerene solar cells

Nutifafa Y. Doumon, G. Wang, Ryan C. Chiechi, L. Jan Anton Koster

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


The design of novel polymers has brought more attention to bulk heterojunction polymer:fullerene solar cells in the past decade. A typical example is the synthesis, through chemical structure engineering, of the benzodithiophene-co-thieno[3,4-b]thiophene (BDT-TT) polymers leading to power conversion efficiency of over 10%. In this work, we study the stability for a set of PBDT-TT polymers. We conduct a systematic UV-degradation study on the solar cells. Most importantly, the paper shows clearly the effect of polymer chemical structure on the UV-degradation pathway of the solar cells. We find that based on the polymer chemical structure, solar cells of polymers with alkoxy side chains are more stable (<20% loss in PCE) than those with alkylthienyl side chains (∼48% loss in PCE) over the period of study. These findings pave the way for new materials that yield efficient as well as stable organic solar cells.

Original languageEnglish (US)
Pages (from-to)6611-6619
Number of pages9
JournalJournal of Materials Chemistry C
Issue number26
StatePublished - 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry


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