Vapor-phase-processed fluorinated self-assembled monolayer for organic thin-film transistors

Jeongkyun Roh, Changhee Lee, Jeonghun Kwak, Byung Jun Jung, Hyeok Kim

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A vapor-phase-processed fluorinated silazane self-assembled monolayer (SAM), 1,3-bis(trifluoropropyl)-1,1,3,3-tetramethyldisilazane (FPDS), was introduced as a surface modifier for pentacene-based organic thin-film transistors (OTFTs). A remarkable improvement in the field effect mobility from 0.25 cm2/Vs (without SAM-treatment) to 0.42 cm2/Vs (with FPDS-treatment) was observed, which was attributed to the better pentacene growth on a hydrophobic surface. A significant reduction in the contact resistance was also observed by FPDS treatment due to the improved bulk conductivity and diminished charge trapping at the gate dielectric surface by the SAM treatment. In addition, FPDS treatment efficiently improved the bias stability of the OTFTs; the drain-to-source current degradation by the bias stress was greatly reduced from 80% to 50% by FPDS treatment, and the characteristic time for charge trapping of the FPDS treated OTFTs was approximately one order of magnitude larger than that of the OTFTs without SAM treatment.

Original languageEnglish
Pages (from-to)941-945
Number of pages5
JournalJournal of the Korean Physical Society
Issue number5
StatePublished - 26 Sep 2015


  • Bias stability
  • Organic thin film transistors
  • Self-assembled monolayer


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