Difluorobenzoxadiazole-Based Polymer Semiconductors for High-Performance Organic Thin-Film Transistors with Tunable Charge Carrier Polarity

Shengbin Shi, Yuxi Wang, Mohammad Afsar Uddin, Xin Zhou, Han Guo, Qiaogan Liao, Xucheng Zhu, Xing Cheng, Han Young Woo, Xugang Guo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A series of difluorobenzoxadiazole-based copolymers are synthesized for applications in high-performance organic thin-film transistors. Four π-spacers with distinct electrical properties, bithiophene, difluorobithiophene, 2-thiophene-2′-thiazole, and bithiazole, are inserted between head-to-head linkage containing bithiophene to promote polymer chain packing. Among the series, polymer containing bithiophene exhibits a unipolar p-channel performance with a substantial hole mobility of 2.92 cm2 V−1 s−1, and minor structural modification leads to polymer containing bithiazole showing a remarkable unipolar n-channel performance with an electron mobility of 0.83 cm2 V−1 s−1. Through a simple structural modification, such a drastic charge carrier polarity change without sacrificing mobility is elusive in organic thin-film transistor field. Polymer containing hybrid 2-thiophene-2′-thiazole spacer exhibits ambipolarity with encouraging hole/electron mobility of 0.27/0.35 cm2 V−1 s−1, and polymer containing difluorobithiophene shows an average hole mobility of 0.53 cm2 V−1 s−1. Among the results, p-channel transistors exhibit encouraging device stability. The results demonstrate that difluorobenzoxadiazole is a versatile building block for enabling high-mobility semiconductors with variable charge carrier polarity. X-ray diffraction reveals that all difluorobenzoxadiazole-based polymers have substantial film crystallinity with close π-stacking and varied polymer chain orientation. The structure–property–device performance correlations from this study offer useful insights for materials innovation in organic thin-film transistors.

Original languageEnglish
Article number1700100
JournalAdvanced Electronic Materials
Volume3
Issue number12
DOIs
Publication statusPublished - 2017 Dec 1

Keywords

  • ambipolarity
  • difluorobenzoxadiazole-based polymer semiconductor
  • electron mobility
  • hole mobility
  • organic thin-film transistor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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