High-Performing Thin-Film Transistors in Large Spherulites of Conjugated Polymer Formed by Epitaxial Growth on Removable Organic Crystalline Templates

Jae Yoon Kim, Da Seul Yang, Jicheol Shin, David Bilby, Kyeongwoon Chung, Hyun Ah Um, Jaehee Chun, Seungmoon Pyo, Min Ju Cho, Jinsang Kim, Dong Hoon Choi

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Diketopyrrolopyrrole (DPP)-based conjugated polymer PDTDPPQT was synthesized and was used to perform epitaxial polymer crystal growth on removable 1,3,5-trichlorobenzene crystallite templates. A thin-film transistor (TFT) was successfully fabricated in well-grown large spherulites of PDTDPPQT. The charge carrier mobility along the radial direction of the spherulites was measured to be 5.46-12.04 cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup>, which is significantly higher than that in the direction perpendicular to the radial direction. The dynamic response of charge transport was also investigated by applying a pulsed bias to TFTs loaded with a resistor (∼20 MΩ). The charge-transport behaviors along the radial direction and perpendicular to the radial direction were investigated by static and dynamic experiments through a resistor-loaded (RL) inverter. The RL inverter made of PDTDPPQT-based TFT operates well, maintaining a fairly high switching voltage ratio (V<inf>out</inf><sup>ON</sup>/V<inf>out</inf><sup>OFF</sup>) at a relatively high frequency when the source-drain electrodes are aligned parallel to the radial direction. (Figure Presented).

Original languageEnglish
Pages (from-to)13431-13439
Number of pages9
JournalACS Applied Materials and Interfaces
Volume7
Issue number24
DOIs
Publication statusPublished - 2015 Jun 24

Keywords

  • alignment
  • conjugated polymer
  • diketopyrrolopyrrole
  • epitaxy
  • thin-film transistor

ASJC Scopus subject areas

  • Materials Science(all)

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