Optical Properties of Ferroelectric Epitaxial K0.5Na0.5NbO3 Films in Visible to Ultraviolet Range

Chernova, E.; Pacherová, O.; Kocourek, T.; Jelínek, M.; Dejneka, A.; Tyunina, M.

doi:10.1371/journal.pone.0153261

Cited by 8 publications

(7 citation statements)

References 32 publications

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“…The value of the band gap of the material was calculated using the Tauc Plot as shown in the inset of Figure . The band gap of KNN was found by extrapolating the linear region of Tauc plot on the x ‐axis and the intercept of the extrapolated line yielded a band gap value of around 3.95 eV which matches well with the reported value of 3.9 eV for KNN( x = 0.34) in literature …”

Section: Resultssupporting

confidence: 86%

Growth of KNN Thin Films for Non‐Linear Optical Applications

Sharma

Gupta

et al. 2017

Physica Status Solidi (a)

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Two-wave mixing is a remarkable area of research in the field of non-linear optics, finding various applications in the development of opto-electronic devices, photorefractive waveguides, real time holography, etc. Non-linear optical properties of ferroelectric potassium sodium niobate (KNN) thin films have been interrogated using two-wave mixing phenomenon. Regarding this, a-axis oriented K 0.35 Na (1-0.35) NbO 3 thin films were successfully grown on epitaxial matched (100) SrTiO 3 substrate using pulsed laser deposition (PLD) technique. The uniformly distributed Au micro-discs of 200 μm diameter were integrated with KNN/STO thin film to study the plasmonic enhancement in the optical response. Beam amplification has been observed as a result of the two-wave mixing. This is due to the alignment of ferroelectric domains in KNN films and the excitement of plasmons at the metal-dielectric (Au-KNN) interface.

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Section: Resultssupporting

confidence: 86%

Growth of KNN Thin Films for Non‐Linear Optical Applications

Sharma

Gupta

et al. 2017

Physica Status Solidi (a)

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“…Successive XRD measurements were performed while keeping the sample and the beam at the same spatial position. The 2θ angle was scanned from 10 to 120° to cover a wide enough range of structural information on SrTiO 3 . − As Figure S1 illustrates, our XRD measurements clearly show the absence of any phase transformation between 25 and 85 °C. Our result is in good agreement with the existing literature, as structural and phase transformations of SrTiO 3 are not encountered in the utilized range of temperatures, i.e., for temperatures between 25 to 85 °C. − …”

Section: Sample Preparation and The Background Of The Experimental Te...mentioning

confidence: 92%

Multidimensionality of the Contact Potential Difference at the Nanoscale in Inorganic Oxides

Guner

Dagdeviren

2022

ACS Appl. Electron. Mater.

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Inorganic-oxide-based sample systems are popular for applications in catalysis, sensing, renewable energy, and fuel cells, in which electronic properties play important roles. Environmental conditions, e.g., temperature, can greatly impact the electronic properties and thereby the performance. The lack of basic knowledge of the local variation of electronic properties as a function of temperature limits the fundamental understanding of systems and hampers their robustness. Here, we present temperature-dependent scanning probe microscopy experiments to reveal the variation of contact potential difference (CPD) across different length scales. Our measurements demonstrate that the CPD of inorganic perovskites (e.g., SrTiO 3 ) and metal-oxide semiconductors (e.g., TiO 2 ) evolves significantly with temperature. We show that CPD variation depends on the locality of the measurement and originates from a thermodynamically driven intrinsic doping state. These results will facilitate a fundamental understanding of the electronic properties of oxides and thus ease emerging technologies, rationalized by engineering temperature-dependent electronic properties.

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“…However, it is always challenging to fabricate high‐quality and uniform KNN‐based films with stoichiometric compositions due to the complexity of the film composition and the volatilization of K and Na elements at high temperatures. Nevertheless, several techniques have been utilized to overcome the initial difficulties to prepare the KNN‐based epitaxial films, for example, PLD, RF magnetron sputtering, sol–gel, HT, and metal organic chemical vapor deposition (MOCVD) …”

Section: Epitaxial Filmsmentioning

confidence: 99%

“…KNN‐based epitaxial films have also drawn attention in some practical applications due to the characteristics different from polycrystalline films as well as bulk ceramics. Researchers have investigated KNN‐based epitaxial films for optical application, surface acoustic wave (SAW) devices, and tunable microwave devices, taking advantage of the manipulated lattice strain, the anisotropy strain, and electric properties in the epitaxial films.…”

Section: Epitaxial Filmsmentioning

confidence: 99%

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

et al. 2019

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Extensive research and great progress of (K,Na)NbO 3 (KNN)-based lead-free piezoelectric films have been driven by the current legislation and the requirement for sustainable development of society and environment in the applications of microelectromechanical systems. A comprehensive discussion of the recent achievement in KNN-based films is presented herein. First, the available synthetic techniques, chemical modification, the ferroelectric and piezoelectric properties of KNN-based films are reviewed, followed by an introduction of the crystal structures and electrical properties of KNN-based epitaxial films in comparison with the bulk ceramics. Finally, the applications of KNN-based films for the sensors, the energy harvesters, and energy storage devices are addressed, and current challenges and prospects for future work are discussed.

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Optical Properties of Ferroelectric Epitaxial K0.5Na0.5NbO3 Films in Visible to Ultraviolet Range

Cited by 8 publications

References 32 publications

Growth of KNN Thin Films for Non‐Linear Optical Applications

Growth of KNN Thin Films for Non‐Linear Optical Applications

Multidimensionality of the Contact Potential Difference at the Nanoscale in Inorganic Oxides

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

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