Low-Voltage Organic Transistors with Carrier Mobilities over 10 cm2V-2s-1Using Six-Branched Organic Azide

Myeongjae Lee, Byung Il Choi, Pyeongkang Ahn, Yoon Young Choi, Yuchan Heo, Jaeseung Kim, Ju Hong Min, Tae Joo Shin, Kwangmin Kim, Huijeong Choi, Hyukmin Kweon, Dong Hae Ho, Jong Il Yoon, Hyunjung Kim, Eunji Lee, Do Hwan Kim, Kyungwon Kwak, Moon Sung Kang, Jeong Ho Cho, Bongsoo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Organic thin-film transistors (OTFTs) are essential components for future flexible/wearable electronics. To fabricate OTFTs in an industrial level, following requirements should be met: high carrier mobility, low-voltage operation, compatibility with a reliable high-resolution patterning process, and high mechanical and electrical stability. Here, we report the synthesis of six-branched cross-linkers (6Bx) having an ultrahigh photo-cross-linking efficiency and its application to photo-patterning gate dielectric (GD) polymers and channel semiconducting (CS) polymers in polymer-based OTFTs. The use of 6Bx permits the generation of a high-resolution-patterned ultra-thin polymer gate dielectric with a low leakage current (7 × 10-9 A cm-2 at 1 MV cm-1). Moreover, cross-linking the GD polymer interfaced with p- or n-type CS polymer induces alignment of CS polymer chains at the interface. This yields excellent hole and electron mobilities of 12.42 and 10.11 cm2 V-1s-1, respectively, from p- and n-type OTFTs operated at <3 V, which are remarkably improved carrier mobilities at substantially low operation voltages compared to those by conventional test beds. Further, the fabrication of logic gates and ring oscillators demonstrates the reliability of polymer OTFTs cross-linked with 6Bx. This work presents a universal strategy for high mobility, reliable, and low-voltage operating OTFTs.

Original languageEnglish
Pages (from-to)10409-10423
Number of pages15
JournalChemistry of Materials
Volume34
Issue number23
DOIs
Publication statusPublished - 2022 Dec 13

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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