Device characteristics of perylene-based transistors and inverters prepared with hydroxyl-free polymer-modified gate dielectrics and thermal post-treatment

Jeong Do Oh, Hoon Seok Seo, Dae Kyu Kim, Eun Sol Shin, Jong-Ho Choi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Organic field-effect transistors (OFETs) and complementary inverters were produced on the basis of n-type N,N′-dioctyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C8) using the neutral cluster beam deposition (NCBD) method. Significant improvements in surface morphology and crystallinity were observed after the surface modification of SiO 2 gate dielectric layers with hydroxyl-free polymer insulators such as polymethylmethacrylate (PMMA) and cyclic olefin copolymer (COC), and thermal post-treatment. Electric characteristics and operational stability of PTCDI-C8-based OFETs were also clearly enhanced after the surface modification, and in particular, the thermally post-treated OFETs with COC-modified SiO 2 gate dielectrics exhibited a high room-temperature mobility of 0.68 cm 2/V s. Two structural types (generic vs. encapsulated) of inverters in top-contact configuration were fabricated by integration of the p-type pentacene and n-type PTCDI-C8 OFETs using COC-modified SiO 2 gate dielectrics. Due to the increased electron mobilities and good coupling between p- and n-type OFETs, hysteresis-free, fast-switching inverters were realized with high gains of ∼20 in the first and third quadrants of voltage transfer characteristics under ambient conditions. The device characteristics of the encapsulated inverters monitored as a function of the time were well maintained with slight degradation.

Original languageEnglish
Pages (from-to)2192-2200
Number of pages9
JournalOrganic Electronics: physics, materials, applications
Volume13
Issue number10
DOIs
Publication statusPublished - 2012 Oct 1

Keywords

  • Cyclic olefin copolymer (COC)
  • N,N′-Dioctyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C8)
  • Neutral cluster beam deposition (NCBD) method
  • Organic field-effect transistors and inverters
  • Pentacene
  • Polymethylmethacrylate (PMMA)

ASJC Scopus subject areas

  • Biomaterials
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Electrical and Electronic Engineering
  • Chemistry(all)
  • Condensed Matter Physics

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