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Space-Charge-Stabilized Ferroelectric Polarization in Self-Oriented Croconic Acid Films

机译：自取向croconic酸膜中的空间电荷稳定的铁电极化

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摘要

Great progress has been made recently in molecular ferroelectrics with properties even comparable to those of inorganic ferroelectrics. However, it is difficult to develop basic thin films and devices for practical applications since most molecular ferroelectrics are uniaxial. The single polar axes of crystallites inside their films, if available, are usually oriented randomly. These can induce the components without contribution to ferroelectric polarization and a large depolarization electric field to suppress polarization. In this work, it is demonstrated that uniaxial croconic acid films in two-terminal devices, deposited by thermal evaporation, can show effective ferroelectric polarization and nonvolatile memory switching behavior with small coercive fields of 11-30 kV cm(-1). The polar c-axes in thick crystalline films (500 nm) are found to be self-oriented nearly at a desired direction. With the assistance of trapped charges, stable ferroelectric polarization can be achieved, in spite of the existence of nonferroelectric components. These may pave a way to utilize uniaxial molecular ferroelectrics for various applications, such as gate dielectrics, electrets, and memory devices.
机译：近来在分子铁电方面已经取得了巨大的进步，其性能甚至可以与无机铁电相比。然而，由于大多数分子铁电体是单轴的，因此难以开发用于实际应用的基本薄膜和器件。如果可以的话，薄膜内部微晶的单极轴通常是随机取向的。这些可以感应出成分而无助于铁电极化和大的去极化电场以抑制极化。在这项工作中，证明了通过热蒸发沉积的两端器件中的单轴铬酸膜可以显示出有效的铁电极化和非易失性存储器开关行为，且矫顽场为11-30 kV cm（-1）。发现厚结晶膜（> 500 nm）中的极性c轴几乎在所需方向上是自定向的。尽管存在非铁电元件，但借助捕获的电荷，仍可实现稳定的铁电极化。这些可以为将单轴分子铁电体用于各种应用铺平道路，例如栅极电介质，驻极体和存储器件。

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  • 来源
    《Advanced Functional Materials》 |2018年第11期|1705463.1-1705463.9|共9页
  • 作者

    Hu Laigui; Feng Rui; Wang Jiao; Bai Zilong; Jin Wei; Zhang Liuqun; Nie Qing-Miao; Qiu Zhi-Jun; Tian Pengfei; Cong Chunxiao; Zheng Lirong; Liu Ran;

  • 作者单位

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Microelect, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

    Zhejiang Univ Technol, Coll Sci, Hangzhou 310023, Zhejiang, Peoples R China;

    Zhejiang Univ Technol, Coll Sci, Hangzhou 310023, Zhejiang, Peoples R China;

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Informat Sci & Technol, Shanghai 200433, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    coercive fields; croconic acid films; ferroelectric polarization; molecular ferroelectrics; space charges;

    机译：矫顽场;月桂酸膜;铁电极化;分子铁电;空间电荷;

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