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<p>Organic field-effect transistor memories (OFETMs) have emerged as a promising technology for next-generation data storage. Their advantages include cost-effectiveness, simplified architecture (single-transistor operation), non-destructive readout, and compatibility with integrated circuits. A critical research focus involves the advancement of polymer electret materials to improve charge-trapping performance. In this study, two carbazole-based electrets, poly(carbazole fluorenone) (PFlCz) and poly(phenylcarbazole fluorenone) (PFlPhCz), were synthesized using an environmentally friendly Friedel–Crafts polymerization method with trifluoromethanesulfonic acid as a catalyst. These polymers were solution-processed as charge-trapping layers in bottom-gate top-contact OFETM devices. Structural modification of PFlPhCz with phenyl substituents extended its molecular conjugation length, thereby increasing the lowest unoccupied molecular orbital (LUMO) energy level to −&#xa0;3.31&#xa0;eV. This optimization significantly enhanced charge-trapping efficiency, leading to an 86% enhancement in the memory window (from 28.53&#xa0;V for PFlCz to 52.21&#xa0;V for PFlPhCz) and a faster switching speed (≤ 0.02&#xa0;s). The PFlPhCz-based device exhibited robust endurance, maintaining an on/off current ratio (I<sub>on</sub>/I<sub>off</sub>) of 3.99 × 10<sup>3</sup> after 300 programming/erase cycles – 13 times higher than that of PFlCz (2.98 × 10<sup>2</sup>). Furthermore, over 90% charge retention was observed after 1.0 × 10<sup>4</sup>&#xa0;s, indicating long-term stability. This research not only presents a sustainable synthesis approach for high-performance electrets but also underscores the potential of phenyl-functionalized carbazole polymers in high-density memory devices and flexible electronics.</p>

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Carbazole-based conjugated polymers as charge trapping layers for organic field-effect transistor memories

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Le Shi,
  • Guang-Wei Zhang,
  • Yue Zhang,
  • Jin-Cheng Zhu,
  • Jie Zhou,
  • Yong Zhang,
  • Hong-Yu Li,
  • Lei Xue

摘要

Organic field-effect transistor memories (OFETMs) have emerged as a promising technology for next-generation data storage. Their advantages include cost-effectiveness, simplified architecture (single-transistor operation), non-destructive readout, and compatibility with integrated circuits. A critical research focus involves the advancement of polymer electret materials to improve charge-trapping performance. In this study, two carbazole-based electrets, poly(carbazole fluorenone) (PFlCz) and poly(phenylcarbazole fluorenone) (PFlPhCz), were synthesized using an environmentally friendly Friedel–Crafts polymerization method with trifluoromethanesulfonic acid as a catalyst. These polymers were solution-processed as charge-trapping layers in bottom-gate top-contact OFETM devices. Structural modification of PFlPhCz with phenyl substituents extended its molecular conjugation length, thereby increasing the lowest unoccupied molecular orbital (LUMO) energy level to − 3.31 eV. This optimization significantly enhanced charge-trapping efficiency, leading to an 86% enhancement in the memory window (from 28.53 V for PFlCz to 52.21 V for PFlPhCz) and a faster switching speed (≤ 0.02 s). The PFlPhCz-based device exhibited robust endurance, maintaining an on/off current ratio (Ion/Ioff) of 3.99 × 103 after 300 programming/erase cycles – 13 times higher than that of PFlCz (2.98 × 102). Furthermore, over 90% charge retention was observed after 1.0 × 104 s, indicating long-term stability. This research not only presents a sustainable synthesis approach for high-performance electrets but also underscores the potential of phenyl-functionalized carbazole polymers in high-density memory devices and flexible electronics.