纤锌矿铁电体的纳米尺度工程：揭示 ScAlN 纳米线中的相变与铁电开关
Nanoscale Engineering of Wurtzite Ferroelectrics: Unveiling Phase Transition and Ferroelectric Switching in ScAlN Nanowires
AI总结：
该研究首次系统考察全 Sc 组成范围的 ScAlN 纳米线相变，发现界面可稳定高 Sc 含量的有序纤锌矿相，并首次证实其铁电开关。
摘要：
对器件极端小型化的追求以及对新颖物理现象的探索，激发了人们对低维条件下晶体相控制和铁电开关的浓厚兴趣。近年来，纤锌矿铁电体已成为一类新兴功能材料，具有引人关注的压电与铁电性能、CMOS 兼容性，以及与主流半导体技术的无缝集成能力。然而，对低维条件下、尤其是纳米结构中晶体相和铁电开关的探索，在很大程度上仍是未知领域。在本研究中，我们首次全面研究了 ScAlN 纳米线在整个 Sc 组成范围内的晶体相变。虽然随着 Sc 含量增加观察到从纤锌矿相到立方相的逐渐转变，但我们进一步证明，对于超过传统薄膜所能实现的 Sc 含量，高度有序的纤锌矿相 ScAlN 可被限制在 ScAlN/GaN 界面处，这为解决纤锌矿铁电体的根本性高矫顽场问题提供了巨大潜力。此外，我们提供了 ScAlN 纳米线中铁电开关的首个证据，这一结果对未来器件小型化具有重要意义。我们对可调谐铁电 ScAlN 纳米线的展示，为纤锌矿铁电体的纳米尺度、畴、合金、应变和量子工程开辟了新的可能性，标志着在开发基于纤锌矿铁电体的下一代小型化器件方面迈出了重要一步。
英文摘要：
The pursuit of extreme device miniaturization and the exploration of novel physical phenomena have spurred significant interest in crystallographic phase control and ferroelectric switching in reduced dimensions. Recently, wurtzite ferroelectrics have emerged as a new class of functional materials, offering intriguing piezoelectric and ferroelectric properties, CMOS compatibility, and seamless integration with mainstream semiconductor technology. However, the exploration of crystallographic phase and ferroelectric switching in reduced dimensions, especially in nanostructures, has remained a largely uncharted territory. In this study, we present the first comprehensive investigation into the crystallographic phase transition of ScAlN nanowires across the full Sc compositional range. While a gradual transition from wurtzite to cubic phase was observed with increasing Sc composition, we further demonstrated that a highly ordered wurtzite phase ScAlN could be confined at the ScAlN/GaN interface for Sc contents surpassing what is possible in conventional films, holding great potential to addressing the fundamental high coercive field of wurtzite ferroelectrics. In addition, we provide the first evidence of ferroelectric switching in ScAlN nanowires, a result that holds significant implications for future device miniaturization. Our demonstration of tunable ferroelectric ScAlN nanowires opens new possibilities for nanoscale, domain, alloy, strain, and quantum engineering of wurtzite ferroelectrics, representing a significant stride towards the development of next-generation, miniaturized devices based on wurtzite ferroelectrics.
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