电极对 PbZr0.2Ti0.8O3 独立薄膜铁电性的影响

IF 4.8 Q2 NANOSCIENCE & NANOTECHNOLOGY ACS Nanoscience Au Pub Date : 2023-10-20 DOI:10.1021/acsnanoscienceau.3c00032
Qiuchen Wu, Kun Wang, Alyssa Simpson, Yifei Hao, Jia Wang, Dawei Li and Xia Hong*, 
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引用次数: 0

摘要

我们报告了底部电极的屏蔽能力、表面粗糙度和界面外延对基于 PbZr0.2Ti0.8O3 (PZT) 的独立膜的极化转换、畴壁 (DW) 粗糙度和铁电居里温度 (TC) 的影响。在金、相关氧化物 LSMO 和二维(2D)半导体 MoS2 基底层上制备了 10-50 nm (001) 的单晶 PZT 和 PZT/La0.67Sr0.33MnO3 (LSMO) 膜。在室温下,切换 PZT 的极化可在 MoS2 沟道中产生非易失性电流调制,其导通/关断比高达 2 × 105,且在 3 天以上的时间内无明显衰减。压电响应力显微镜研究表明,PZT 膜的矫顽力场 Ec 在不同基底层上从 0.75 到 3.0 MV cm-1 不等,并表现出很强的极化不对称性。PZT/LSMO 膜的 Ec 值明显较小,转移到 LSMO 上的样品的对称 Ec 值约为 -0.26/+0.28 MV cm-1,小于外延 PZT 膜的 Ec 值。DW 粗糙度指数 ζ 表明室温下二维无规键无序主导了 DW 粗糙度(ζ = 0.31)。在温度逐渐升高的热淬火条件下,金和 LSMO 上的 PZT 膜的ζ 值接近 1D 无规键无序的理论值(ζ = 2/3),而 MoS2 上的样品则表现出热粗化(ζ = 1/2)。金、LSMO 和 MoS2 上的 PZT 膜的 TC 值分别约为 763 ± 12、725 ± 25 和 588 ± 12 °C,远远超过了基体值。我们的研究揭示了静电和机械边界条件在决定独立 PZT 膜铁电性方面的复杂相互作用,为基于 PZT 的柔性纳米电子器件的功能设计提供了重要的材料参数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Electrode Effect on Ferroelectricity in Free-Standing Membranes of PbZr0.2Ti0.8O3

We report the effects of screening capacity, surface roughness, and interfacial epitaxy of the bottom electrodes on the polarization switching, domain wall (DW) roughness, and ferroelectric Curie temperature (TC) of PbZr0.2Ti0.8O3 (PZT)-based free-standing membranes. Singe crystalline 10–50 nm (001) PZT and PZT/La0.67Sr0.33MnO3 (LSMO) membranes are prepared on Au, correlated oxide LSMO, and two-dimensional (2D) semiconductor MoS2 base layers. Switching the polarization of PZT yields nonvolatile current modulation in the MoS2 channel at room temperature, with an on/off ratio of up to 2 × 105 and no apparent decay for more than 3 days. Piezoresponse force microscopy studies show that the coercive field Ec for the PZT membranes varies from 0.75 to 3.0 MV cm–1 on different base layers and exhibits strong polarization asymmetry. The PZT/LSMO membranes exhibit significantly smaller Ec, with the samples transferred on LSMO showing symmetric Ec of about −0.26/+0.28 MV cm–1, smaller than that of epitaxial PZT films. The DW roughness exponent ζ points to 2D random bond disorder dominated DW roughening (ζ = 0.31) at room temperature. Upon thermal quench at progressively higher temperatures, ζ values for PZT membranes on Au and LSMO approach the theoretical value for 1D random bond disorder (ζ = 2/3), while samples on MoS2 exhibits thermal roughening (ζ = 1/2). The PZT membranes on Au, LSMO, and MoS2 show TC of about 763 ± 12, 725 ± 25, and 588 ± 12 °C, respectively, well exceeding the bulk value. Our study reveals the complex interplay between the electrostatic and mechanical boundary conditions in determining ferroelectricity in free-standing PZT membranes, providing important material parameters for the functional design of PZT-based flexible nanoelectronics.

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ACS Nanoscience Au
ACS Nanoscience Au 材料科学、纳米科学-
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期刊介绍: ACS Nanoscience Au is an open access journal that publishes original fundamental and applied research on nanoscience and nanotechnology research at the interfaces of chemistry biology medicine materials science physics and engineering.The journal publishes short letters comprehensive articles reviews and perspectives on all aspects of nanoscience and nanotechnology:synthesis assembly characterization theory modeling and simulation of nanostructures nanomaterials and nanoscale devicesdesign fabrication and applications of organic inorganic polymer hybrid and biological nanostructuresexperimental and theoretical studies of nanoscale chemical physical and biological phenomenamethods and tools for nanoscience and nanotechnologyself- and directed-assemblyzero- one- and two-dimensional materialsnanostructures and nano-engineered devices with advanced performancenanobiotechnologynanomedicine and nanotoxicologyACS Nanoscience Au also publishes original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials engineering physics bioscience and chemistry into important applications of nanomaterials.
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