Field effect measurements on charge carrier mobilities in various polymer-fullerene blend compositions

E von Hauff, J. Parisi, Vladimir Dyakonov

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

In this study we investigated materials typically used in polymer photovoltaics. Field effect measurements were performed in order to determine the hole mobilities in the conjugated polymer poly(3-hexylthiophene) (P3HT) and the electron mobilities in the methanofullerene[6,6]-phenyl C61-butyric acid methyl ester (PCBM), and, particularly, in the polymer-fullerene composite blends. Regarding the pure films, electron mobilities in PCBM were found to be in the 10− 2 cm2/Vs range, and hole mobilities in P3HT were found to be in the 10− 3 cm2/Vs range. In the PCBM:P3HT blends, it was found that varying the PCBM content in PCBM:P3HT blends led to a steep increase in electron mobility with increasing PCBM content, while the hole mobility was found to slightly decrease with the increasing PCBM concentration. In 2:1 PCBM:P3HT tempered blends, the charge carrier mobilities were found to be roughly balanced, at 10− 3 cm2/Vs. For improved electron transport in the blends, tempering was found to be crucial.
Original languageEnglish
Pages (from-to)506-511
JournalThin Solid Films
Volume511-512
DOIs
Publication statusPublished - 26 Jul 2006

Keywords

  • polymer solar cells
  • OFETs
  • charge carrier mobility

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