Solvent-dependent electrical characteristics and stability of organic thin-film transistors with drop cast bis(triisopropylsilylethynyl) pentacene

Chang Su Kim, Stephanie Lee, Enrique Daniel Gomez, John E. Anthony, Yueh Lin Loo

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Abstract

The solvent from which the active layer is drop cast dramatically influences the electrical characteristics and electrical stability of thin-film transistors comprising bis(triisopropylsilylethynyl) pentacene. Casting from high boiling solvents allows slower crystallization; devices cast from toluene and chlorobenzene thus exhibit mobilities >0.1 cm2 /V s and on/off ratios of ∼ 106. More importantly, the solvent choice influences the device stability. Devices from toluene exhibit stable characteristics, whereas devices from chlorobenzene show hystereses on cycling, with dramatic threshold voltage shifts toward positive voltages. The instability in chlorobenzene devices is attributed to the migration of water and solvent impurities to the charge transport interface on repetitive testing.

Original languageEnglish (US)
Article number103302
JournalApplied Physics Letters
Volume93
Issue number10
DOIs
StatePublished - Sep 19 2008

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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