Thickness-dependent microwave dielectric and nonlinear optical properties of Bi0.5Na0.5TiO3 thin films

Pattipaka, Srinivas; Joseph, Andrews; Bharti, Gyan Prakash; Raju, K. C. James; Khare, Alika; Pamu, D.

doi:10.1016/j.apsusc.2019.05.264

Cited by 30 publications

(8 citation statements)

References 44 publications

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“…These modes are similar to prior research. 21 At the mid-frequency range, the Raman mode centered at 282.32 cm −1 belongs to Ti-O (site-B) vibrations, while the observed mode around 539.85 cm −1 is attributed to Ti-O octahedral. Finally, broad bands appeared at 818.66 cm −1 at a high-frequency range due to the displacement of the oxygen in TiO 6 octahedral and the presence of oxygen vacancies.…”

Section: Resultsmentioning

confidence: 94%

Influence of NaOH Concentration on Structural, Morphological, Optical, and Electrical Characterization of Perovskite Sodium Bismuth Titanate Prepared by Hydrothermal Method

Nahedh,

Salman,

Ismail

2024

ECS J. Solid State Sci. Technol.

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The hydrothermal method successfully prepares a lead-free sodium bismuth titanate (NBT) perovskite film. The prepared films were studied structurally, and morphologically using X-ray diffraction, and field-emission scanning electron microscopy (FESEM), respectively. Varying the concentration of NaOH showed a noticeable effect on the properties studied. Good crystallization of NBT perovskite films without impurities was obtained at 18 and 20 M concentrations, where the crystalline size was 14 nm according to the Scherer equation. Also, when varying the concentration of NaOH, a similar film thickness was obtained through a cross-section of the FESEM images. It was observed that there was a difference in the intensity of the peaks of the photoluminescence spectra of the prepared films with a change in the concentration of NaOH, which confirms a change in the concentration of oxygen vacancies. The activation energy of the prepared films was deduced from the Arrhenius plot, as it showed small values in the films prepared with a low concentration of NaOH. The results showed that the maximum value of mobility of NBT films was at 20 M of NaOH concentration through the Hall Effect.

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Section: Resultsmentioning

confidence: 94%

Influence of NaOH Concentration on Structural, Morphological, Optical, and Electrical Characterization of Perovskite Sodium Bismuth Titanate Prepared by Hydrothermal Method

Nahedh,

Salman,

Ismail

2024

ECS J. Solid State Sci. Technol.

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“…The results are similar to the previous work in other materials. 23,24) It is apparently seen in Fig. 3(c) that the real parts of the complex dielectric constants in photo energy of 1.5-5.3 eV are decreased with reducing film thickness.…”

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confidence: 89%

Dielectric function and band gap modulation in perovskite SrRuO₃ thin film

Zhang¹,

Zhou²,

Duan³

2021

Appl. Phys. Express

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An effective method for studying the relationship of dielectric functions and thickness in perovskite SrRuO 3 (SRO) thin film was proposed by spectroscopic ellipsometry measurement. A wedge-shaped SRO film with various thickness was prepared on SrTiO 3 substrate by pulse laser deposition, whose dielectric functions and thickness were obtained by using the Drude-Lorentz dispersive model. The acquired band gap is slightly enhanced with film thickness reducing due to the one-dimensional quantum confinement effect and the disorder effect. The proposed method is expected to be applied for dielectric modulation in perovskite photonic device.

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“…Modulation by Thickness. Thickness strongly influences the nonlinear absorption coefficients of materials, which may result in differences by orders of magnitude, 68,69 and the same is true for perovskites. The previous studies mainly focused on colloids or blocks of perovskites, whose thicknesses were on the order of millimeters, and the measured nonlinear absorption coefficients were usually only on the order of 10 −2 cm/GW.…”

Section: Properties Of Perovskitesmentioning

confidence: 99%

Nonlinear Optics in Lead Halide Perovskites: Mechanisms and Applications

Shen

Chen

et al. 2020

ACS Photonics

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Because of their unique and excellent photophysical properties, lead halide perovskites are widely used in photoelectronic devices such as photodetectors, light-emitting diodes, solar cells, and lasers. Recently it was found that lead halide perovskites also exhibit excellent nonlinear optical properties in nonlinear optics (NLO), including saturated absorption, two-or multiphoton absorption, and nonlinear refraction. It is believed that perovskites will be serious nonlinear optical materials in the future. The nonlinear optical devices prepared from perovskites on the basis of their optical nonlinearity may open up a new viewpoint for the application of information and communication technology. Here the research on lead halide perovskites in NLO is reviewed. The mechanism of nonlinear optical phenomena of lead halide perovskites is analyzed, and some possible methods to improve the optical nonlinearity are summarized. Their applications in passive Q-switched lasers, upconversion lasers, optical limiting, and infrared detection are introduced. Several future research directions and challenges of lead halide perovskites in nonlinear optics are proposed.

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Thickness-dependent microwave dielectric and nonlinear optical properties of Bi0.5Na0.5TiO3 thin films

Cited by 30 publications

References 44 publications

Influence of NaOH Concentration on Structural, Morphological, Optical, and Electrical Characterization of Perovskite Sodium Bismuth Titanate Prepared by Hydrothermal Method

Influence of NaOH Concentration on Structural, Morphological, Optical, and Electrical Characterization of Perovskite Sodium Bismuth Titanate Prepared by Hydrothermal Method

Dielectric function and band gap modulation in perovskite SrRuO₃ thin film

Nonlinear Optics in Lead Halide Perovskites: Mechanisms and Applications

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Thickness-dependent microwave dielectric and nonlinear optical properties of Bi0.5Na0.5TiO3 thin films

Cited by 30 publications

References 44 publications

Influence of NaOH Concentration on Structural, Morphological, Optical, and Electrical Characterization of Perovskite Sodium Bismuth Titanate Prepared by Hydrothermal Method

Influence of NaOH Concentration on Structural, Morphological, Optical, and Electrical Characterization of Perovskite Sodium Bismuth Titanate Prepared by Hydrothermal Method

Dielectric function and band gap modulation in perovskite SrRuO3 thin film

Nonlinear Optics in Lead Halide Perovskites: Mechanisms and Applications

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Dielectric function and band gap modulation in perovskite SrRuO₃ thin film