Small Molecule/Polymer Blend Organic Transistors with Hole Mobility Exceeding 13 cm2V−1s−1

Alexandra F. Paterson, Neil D. Treat, Weimin Zhang, Zhuping Fei, Gwenhivir Wyatt-Moon, Hendrik Faber, George Vourlias, Panos A. Patsalas, Olga Solomeshch, Nir Tessler, Martin Heeney, Thomas Anthopoulos*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

112 Scopus citations

Abstract

The development of third-generation hole-transporting organic blend semiconductors and their application in high mobility OTFTs was reported. The small-molecule 2,7-dioctyl[1]-benzothieno[3,2-b][1]benzothiophene (C8 -BTBT) was chosen due to its high solubility in various organic solvents and also because of its ability to form large inter molecular overlaps arising from well-ordered molecular arrays, which under certain circumstances can lead to exceptionally high hole mobilities. Indacenodithiophene-benzothiadiazole was selected as the complementary polymer binder primarily due to its good solubility, high hole mobility and comparable highest occupied molecular orbital (HOMO) energy level to that of C8 ?BTBT. The use of solvent mixtures for dissolving the C8-BTBT and Indacenodithiophene-benzothiadiazole was also investigated and has been shown to have a remarkable influence on the resulting layer morphology and overall transistor performance. Although it is currently difficult to identify - with a high degree of certainty - the dominant mechanism(s) responsible for the observed dramatic enhancement of the hole mobility, the results obtained indicate the coexistence of more than one process, with the most dominant process being the deactivation of hole traps.

Original languageEnglish (US)
Pages (from-to)7791-7798
Number of pages8
JournalAdvanced Materials
Volume28
Issue number35
DOIs
StatePublished - Jan 1 2016

Keywords

  • organic semiconducting blends
  • organic thin-film transistor
  • phase separation
  • small molecule polymer blends
  • solvent blend

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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