Impact of blend morphology on interface state recombination in bulk heterojunction organic solar cells

Benjamin Bouthinon, Raphaël Clerc, Jérôme Vaillant, Jean Marie Verilhac, Jérôme Faure-Vincent, David Djurado, Irina Ionica, Gabriel Man, Antoine Gras, Georges Pananakakis, Romain Gwoziecki, Antoine Kahn

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

This work is a reinvestigation of the impact of blend morphology and thermal annealing on the electrical performance of regioregular-P3HT:PC60 BM bulk heterojunction organic solar cells. The morphological, structural, and electrical properties of the blend are experimentally investigated with atomic force microscopy, X-ray diffraction, and time-of-fl ight measurements. Current- voltage characteristics of photodiode devices are measured in the dark and under illumination. Finally, the existence of exponential electronic band tails due to gap states is experimentally confirmed by measuring the device spectral response in the subband gap regime. This method reveals the existence of a large density of gap states, which is partially and systematically reduced by thermal annealing. When the band tails are properly accounted for in the drift and diffusion simulations, experimentally measured charge transport characteristics, under both dark and illuminated conditions and as a function of annealing time, can be satisfactorily reproduced. This work further confirms the critical impact of tails states on the performance of solar cells.

Original languageEnglish (US)
Pages (from-to)1090-1101
Number of pages12
JournalAdvanced Functional Materials
Volume25
Issue number7
DOIs
StatePublished - Feb 18 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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