DNA-based small molecules for hole charge injection and channel passivation in organic heptazole field effect transistors

Youngsuk Cho, Junyeong Lee, June Yeong Lim, Sanghyuck Yu, Yeonjin Yi, Seongil Im

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

DNA-based small molecules of guanine, cytosine, thymine and adenine are adopted for the charge injection layer between the Au electrodes and organic semiconductor, heptazole (C26H16N2). The heptazole-channel organic field effect transistors (OFETs) with a DNA-based small molecule charge injection layer showed higher hole mobility (maximum 0.12 cm2 V-1 s-1) than that of a pristine device (0.09 cm2 V-1 s-1). We characterized the contact resistance of each device by a transfer length method (TLM) and found that the guanine layer among all DNA-based materials performs best as a hole injection layer leading to the lowest contact resistance. Since the guanine layer is also known to be a proper channel passivation layer coupled with a thin conformal Al2O3 layer protecting the channel from bias stress and ambient molecules, we could realize ultra-stable OFETs utilizing guanine/Au contact and guanine/Al2O3 bilayer on the organic channel.

Original languageEnglish
Article number065107
JournalJournal of Physics D: Applied Physics
Volume50
Issue number6
DOIs
Publication statusPublished - 2017 Jan 13

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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