Full Range Dielectric Characteristics of Calcium Copper Titanate Thin Films Prepared by Continuous Composition-Spread Sputtering

Kang, Hyo Min; Baek, Seung Hyub; Song, Jee-Hun; Cho, Yong Soo; Choi, Ji Won

doi:10.1021/co500057u

Cited by 16 publications

(15 citation statements)

References 33 publications

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“…The first intercept value of resistance is around 9.3−9.7 kΩ, which is interestingly very close to the 9.3 kΩ value reported as a grain boundary resistance for polycrystalline CaCu 3 Ti 4 O 12 thin films. 22 Accordingly, domain boundary or short-range grain boundary may explain the unusual observation of resistance contributor. All the facts point out the unexpected existence of ferroelectricity and thus dipolar polarization, which must be the origin of the high dielectric constant.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Origin of Abnormal Dielectric Behavior and Chemical States in Amorphous CaCu₃Ti₄O₁₂ Thin Films on a Flexible Polymer Substrate

2017

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High dielectric constant thin films processable at nearly room temperature have been demanded for various flexible electronic devices. Here, we explore the origin of abnormal dielectric behavior of amorphous CaCu3Ti4O12 (CCTO) thin films having an exceptionally high dielectric constant, in conjunction with chemical states and unusual ferroelectricity in the amorphous state. As an optimal example, the amorphous CCTO film sputtered at room temperature under an oxygen partial pressure of 3.6 mTorr exhibits a dielectric constant of ∼192 and a dielectric loss of <0.1 at 100 Hz. The promising dielectric characteristics are unexpectedly found to originate from the evolution of ferroelectric domains, even in the amorphous state. Strong dependence of oxygen partial pressure on chemical states, vacancy formation, and ferroelectric polarization is very critical for the unexpected dielectric behavior. This may be the very first example of exploring the origin of amorphous dielectric behavior for a material that possesses space charge polarization.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Origin of Abnormal Dielectric Behavior and Chemical States in Amorphous CaCu₃Ti₄O₁₂ Thin Films on a Flexible Polymer Substrate

2017

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“…The optimization of these YBCO nanocomposite films can be accelerated by means of combinatorial methods. Concerning the thin-film deposition of oxide materials, PLD and sputtering process have been mostly applied for the creation of a continuous composition spread (CCS) [51][52][53]. The CCS method is often used to explore compositions with two or more different elements.…”

Section: Transport Measurements Of Pristine and Hfo 2 -Ybco Filmsmentioning

confidence: 99%

Superconducting HfO2-YBa2Cu3O7−δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions

et al. 2019

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To reduce the fabrication costs while maximizing the superconducting and pinning properties of YBa2Cu3O7−δ (YBCO) nanocomposite films, the drop-on-demand ink-jet printing technique was used to deposit colloidal YBCO inks onto LaAlO3 substrates. These inks containing preformed HfO2 nanocrystals were carefully adjusted, prior to the jettability, as the droplet formation depends on the rheological properties of the inks themselves. After carefully adjusting printing parameters, 450-nm thick pristine YBCO films with a self-field critical current density (Jc) of 2.7 MA cm−² at 77 K and 500-nm thick HfO2-YBCO nanocomposite films with a self-field Jc of 3.1 MA·cm−² at 77 K were achieved. The final HfO2-YBCO nanocomposite films contained dispersed BaHfO3 particles in a YBCO matrix due to the Ba2+ reactivity with the HfO2 nanocrystals. These nanocomposite films presented a more gradual decrease of Jc with the increased magnetic field. These nanocomposite films also showed higher pinning force densities than the pristine films. This pinning enhancement was related to the favorable size and distribution of the BaHfO3 particles in the YBCO matrix.

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“…This is where automation and high throughput experimentation is advantageous. For instance, high throughput calculations, i.e., purely theoretical approaches, investigated stability parameters and properties for mainly inorganic perovskites , but also for hybrid perovskites. − Experiments on the high throughput scale were performed on inorganic perovskite materials, mainly using different approaches from the gas phase including combustion techniques, , sputtering, , vapor deposition, or molecular beam epitaxy . Kawashima et al showed a method to produce different thicknesses and molecular ratios on the larger scale for the hybrid perovskite CH 3 NH 3 PbI 3 by molecular beam epitaxy .…”

Section: Introductionmentioning

confidence: 99%

Rapid Characterization and Parameter Space Exploration of Perovskites Using an Automated Routine

et al. 2019

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Hybrid, e.g., organic inorganic, perovskites from the type methylammonium lead iodide CH 3 NH 3 PbI 3 are promising solar cell materials. However, due to the large parameter space spanned by the manifold combinations of divalent metals with organic cations and anions, an efficient approach is needed to rapidly test and categorize new promising materials. Herein, we developed a high throughput approach for the automated synthesis of perovskite layers with different precursor ratios at varying annealing temperatures. The layers were analyzed by optical absorption and photoluminescence (PL) spectroscopy as well as X-ray diffraction (XRD) and evaluated using two different procedures. The first one is a stepwise exclusion of nonperforming reactant ratios and synthesis conditions by using both spectroscopic techniques, followed by a final validation of the procedure by XRD. In the second procedure, only PL results were consulted in combination with high throughput screening using design of experiments (DoE) to reduce the total number of experiments needed and compared to the manual cascade approach. Noteworthy, by simple PL screening, it was possible to identify the best ratio of perovskite to byproducts and annealing temperature. Thus, only with PL, more detailed results as with the manual protocol were reached, while at the same time the effort for characterization was significantly reduced (by 60% of the experimental time). In conclusion, our approach opens a way toward fast and efficient identification of new promising materials under different reaction and process conditions.

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Full Range Dielectric Characteristics of Calcium Copper Titanate Thin Films Prepared by Continuous Composition-Spread Sputtering

Cited by 16 publications

References 33 publications

Origin of Abnormal Dielectric Behavior and Chemical States in Amorphous CaCu₃Ti₄O₁₂ Thin Films on a Flexible Polymer Substrate

Origin of Abnormal Dielectric Behavior and Chemical States in Amorphous CaCu₃Ti₄O₁₂ Thin Films on a Flexible Polymer Substrate

Superconducting HfO2-YBa2Cu3O7−δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions

Rapid Characterization and Parameter Space Exploration of Perovskites Using an Automated Routine

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Full Range Dielectric Characteristics of Calcium Copper Titanate Thin Films Prepared by Continuous Composition-Spread Sputtering

Cited by 16 publications

References 33 publications

Origin of Abnormal Dielectric Behavior and Chemical States in Amorphous CaCu3Ti4O12 Thin Films on a Flexible Polymer Substrate

Origin of Abnormal Dielectric Behavior and Chemical States in Amorphous CaCu3Ti4O12 Thin Films on a Flexible Polymer Substrate

Superconducting HfO2-YBa2Cu3O7−δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions

Rapid Characterization and Parameter Space Exploration of Perovskites Using an Automated Routine

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Origin of Abnormal Dielectric Behavior and Chemical States in Amorphous CaCu₃Ti₄O₁₂ Thin Films on a Flexible Polymer Substrate

Origin of Abnormal Dielectric Behavior and Chemical States in Amorphous CaCu₃Ti₄O₁₂ Thin Films on a Flexible Polymer Substrate