Modification of PCBM crystallization via incorporation of C60 in polymer/fullerene solar cells

Jeffrey J. Richards, Andrew H. Rice, Rainie D. Nelson, Felix S. Kim, Samson A. Jenekhe, Christine K. Luscombe, Danilo C. Pozzo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

The morphological effects of the incorporation of C60 into blended thin-films of poly(3-hexylthiophene) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) are investigated. The results show that addition of C60 readily alters the growth-rate and morphology of PCBM crystallites under different environmental conditions. The effect of C 60 on the growth of large PCBM crystallites is thoroughly characterized using optical microscopy, electron microscopy and UV-visible absorption spectroscopy. Results show that C60 incorporation modifies fullerene aggregation and crystallization and greatly reduces the average crystallite size at C60 loadings of ≈50 wt% in the fullerene phase. Organic field-effect transistors (OFETs) are prepared to evaluate the electron mobility of PCBM/C60 films and organic solar cells (OSCs) are fabricated from mixed-fullerene active layers to evaluate their performance. It is demonstrated that the use of fullerene mixtures in organic electronic applications is a viable approach to produce more stable devices and to control the growth of micrometer-sized fullerene crystals.

Original languageEnglish (US)
Pages (from-to)514-522
Number of pages9
JournalAdvanced Functional Materials
Volume23
Issue number4
DOIs
StatePublished - Jan 28 2013

Keywords

  • crystallite materials
  • fullerene
  • overgrowth
  • polymer solar cells
  • stability

ASJC Scopus subject areas

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

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