Versatile threshold voltage control of OTFTs via discontinuous pn-heterojunction formation

Boeun Cho, Seong Hun Yu, Moo Hyung Lee, Juhee Lee, Jun Young Lee, Jeong Ho Cho, Moon Sung Kang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We demonstrate the versatility of the threshold voltage control for organic thin-film transistors (OTFTs) based on formation of discontinuous pn-heterojunction on the active channel layer. By depositing n-type dioctyl perylene tetracarboxylic diimide molecules discontinuously onto base p-type pentacene thin films (the formation of the discontinuous pn-heterojunction), a positive shift of the threshold voltage was attained which enabled realizing a depletion-mode transistor from an original enhancement-mode pristine pentacene transistor. Careful control of the threshold voltage based on this method led assembling a depletion-load inverter comprising a depletion-mode transistor and an enhancement-mode transistor connected in series that yielded tunable signal inversion voltage approaching 0 V. In addition, the tunability could be applied to improve the program/erase signal ratio for non-volatile transistor memories by more than 4 orders of magnitude compared to reference memory devices made of pristine pentacene transistors.

Original languageEnglish
Pages (from-to)3439-3444
Number of pages6
JournalOrganic Electronics
Volume15
Issue number12
DOIs
Publication statusPublished - 2014 Dec

All Science Journal Classification (ASJC) codes

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

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