Qiuchen Wu, Kun Wang, Alyssa Simpson, Yifei Hao, Jia Wang, Dawei Li and Xia Hong*,
{"title":"电极对 PbZr0.2Ti0.8O3 独立薄膜铁电性的影响","authors":"Qiuchen Wu, Kun Wang, Alyssa Simpson, Yifei Hao, Jia Wang, Dawei Li and Xia Hong*, ","doi":"10.1021/acsnanoscienceau.3c00032","DOIUrl":null,"url":null,"abstract":"<p >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 (<i>T</i><sub>C</sub>) of PbZr<sub>0.2</sub>Ti<sub>0.8</sub>O<sub>3</sub> (PZT)-based free-standing membranes. Singe crystalline 10–50 nm (001) PZT and PZT/La<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub> (LSMO) membranes are prepared on Au, correlated oxide LSMO, and two-dimensional (2D) semiconductor MoS<sub>2</sub> base layers. Switching the polarization of PZT yields nonvolatile current modulation in the MoS<sub>2</sub> channel at room temperature, with an on/off ratio of up to 2 × 10<sup>5</sup> and no apparent decay for more than 3 days. Piezoresponse force microscopy studies show that the coercive field <i>E</i><sub>c</sub> for the PZT membranes varies from 0.75 to 3.0 MV cm<sup>–1</sup> on different base layers and exhibits strong polarization asymmetry. The PZT/LSMO membranes exhibit significantly smaller <i>E</i><sub>c</sub>, with the samples transferred on LSMO showing symmetric <i>E</i><sub>c</sub> of about −0.26/+0.28 MV cm<sup>–1</sup>, 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 MoS<sub>2</sub> exhibits thermal roughening (ζ = 1/2). The PZT membranes on Au, LSMO, and MoS<sub>2</sub> show <i>T</i><sub>C</sub> 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.</p>","PeriodicalId":29799,"journal":{"name":"ACS Nanoscience Au","volume":"3 6","pages":"482–490"},"PeriodicalIF":4.8000,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsnanoscienceau.3c00032","citationCount":"0","resultStr":"{\"title\":\"Electrode Effect on Ferroelectricity in Free-Standing Membranes of PbZr0.2Ti0.8O3\",\"authors\":\"Qiuchen Wu, Kun Wang, Alyssa Simpson, Yifei Hao, Jia Wang, Dawei Li and Xia Hong*, \",\"doi\":\"10.1021/acsnanoscienceau.3c00032\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >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 (<i>T</i><sub>C</sub>) of PbZr<sub>0.2</sub>Ti<sub>0.8</sub>O<sub>3</sub> (PZT)-based free-standing membranes. Singe crystalline 10–50 nm (001) PZT and PZT/La<sub>0.67</sub>Sr<sub>0.33</sub>MnO<sub>3</sub> (LSMO) membranes are prepared on Au, correlated oxide LSMO, and two-dimensional (2D) semiconductor MoS<sub>2</sub> base layers. Switching the polarization of PZT yields nonvolatile current modulation in the MoS<sub>2</sub> channel at room temperature, with an on/off ratio of up to 2 × 10<sup>5</sup> and no apparent decay for more than 3 days. Piezoresponse force microscopy studies show that the coercive field <i>E</i><sub>c</sub> for the PZT membranes varies from 0.75 to 3.0 MV cm<sup>–1</sup> on different base layers and exhibits strong polarization asymmetry. The PZT/LSMO membranes exhibit significantly smaller <i>E</i><sub>c</sub>, with the samples transferred on LSMO showing symmetric <i>E</i><sub>c</sub> of about −0.26/+0.28 MV cm<sup>–1</sup>, 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 MoS<sub>2</sub> exhibits thermal roughening (ζ = 1/2). The PZT membranes on Au, LSMO, and MoS<sub>2</sub> show <i>T</i><sub>C</sub> of about 763 ± 12, 725 ± 25, and 588 ± 12 °C, respectively, well exceeding the bulk value. 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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.
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.