Correlation between crystallinity and solar-cell efficiency of the low-bandgap polymer PDDTP

Joachim A. Renz, Raja Shahid Ashraf, Tobias Erb, Sviatoslav Shokhovets, Gerhard Gobsch, Elisabeth Klemm, Harald Hoppe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Polymer/fullerene bulk heterojunction solar cells consisting of PDDTP:PCBM blends have been investigated and optimized. The structural properties of the photoactive layers were studied by GID-XRD, which revealed a pronounced response of photovoltaic parameters on the polymer crystallinity. In addition to P3HT, another donor polymer was found that develops crystalline domains upon annealing. We found a clear correlation between annealing time, power conversion efficiency, and polymer crystallinity. The PDDTP crystallization ability is a promising property. This is a first step toward the synthesis of lowbandgap polymers, which likewise show the ability to form crystalline domains and may therefore lead to a substantial increase in efficiency.

Original languageEnglish (US)
Pages (from-to)1689-1694
Number of pages6
JournalMacromolecular Chemistry and Physics
Issue number15
StatePublished - Aug 2 2010
Externally publishedYes


  • Crystallization
  • Fullerenes
  • Polymer solar cells
  • Structure-property relations
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Chemistry
  • Polymers and Plastics
  • Physical and Theoretical Chemistry
  • Organic Chemistry


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