Design and Characterization of Novel Barium Strontium Titanate Thick Films for Sub-6 GHz RF Applications

Bouca, Patricia; Figueiredo, Ricardo; Wlodarkiewicz, Anna; Tkach, Alexander; Matos, João N.; Vilarinho, Paula M.; Carvalho, Nuno Borges

doi:10.1109/tmtt.2021.3125030

Cited by 8 publications

(2 citation statements)

References 35 publications

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“…Since the tunability of a ferroelectric material is maximized near its Curie point, incipient ferroelectrics such as SrTiO 3 (ST) are useful at cryogenic temperatures (T), whereas regular ferroelectrics such as BaTiO 3 are more suitable above room T [2,15]. Solid solutions of these materials are mainly used for near-room-T applications [4,5,[9][10][11][12][13]16,18].…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Dielectric Response of Strontium Titanate Thin Films Manipulated by Zn Doping

2022

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The voltage dependence of the dielectric permittivity ε′ and the low dielectric loss tanδ of incipient ferroelectrics have drawn vast attention to the use of these materials for the development of tuning elements in electronics and telecommunications. Here, we study the DC electric field dependence of low-temperature ε′ in ~320 nm thick sol-gel-derived SrTi1−xZnxO3−δ thin films with x = 0.01 and 0.05, deposited on Pt/TiO2/SiO2/Si substrates. Incorporation of Zn onto Ti sites is found to decrease ε′ compared to undoped SrTiO3 films, while increasing the relative tunability nr up to ~32.9% under a DC electric field of 125 kV/cm at low temperatures. The hysteresis-free variation in ε′ with electric field and tanδ values below 0.6% observed for SrTi1−xZnxO3−δ film with x = 0.01 make this compound more attractive for tunable device applications.

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Section: Introductionmentioning

confidence: 99%

Low-Temperature Dielectric Response of Strontium Titanate Thin Films Manipulated by Zn Doping

2022

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“…Barium strontium titanate (BST) solid solutions are frequently employed in phase shifters, dielectric energy storage devices, solid-state cooling devices, and other applications because of their comparatively low loss and high tunability. [1][2][3][4] Numerous researchers have fabricated BST thin films on various substrates in accordance with their applicability in various contexts, and have evaluated the structure and electrical feature of such films. Ba 0.5 Sr 0.5 TiO 3 and BaZr 0.15 Ti 0.85 O 3 bilayer thin films were created by Mahesh et al [5] on Pt/Si plates in an effort to reduce the leakage current density.…”

Section: Introductionmentioning

confidence: 99%

Optimized Tunability of Barium Strontium Titanate Thin Films onto Different Plates with Proper Buffer Layers

Dong

Liang

Hui

et al. 2022

Physica Status Solidi (b)

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Misfit strain, polarization, permittivity, and tunability of Ba x Sr1−x TiO3 (BST) thin films on various substrates with varied buffer layers are calculated by a modified thermodynamic model. The lattice parameters of the LaAlO3 (LAO), CaTiO3 (CT), BaZr0.25Ti0.75O3 (BZT), and MgO buffer layers grow consecutively as does the thermal expansion coefficient (TEC) of the Si, Ti, Ni, and stainless steel (SS) substrates. When the TEC of substrates is bigger (such as Ni, SS) than that of the films, introducing buffer layers with larger lattice parameters (such as BZT, MgO) can improve the permittivity and tunability. Conversely, inserting buffer layers with smaller lattice parameters (such as LAO, CT) can enhance the dielectric response when the TEC of substrates is smaller (such as Si, Ti) than that of the films. The relationship between the TEC of substrate and the lattice parameter of buffer layer is primarily linear for achieving high tunability. According to several references, introducing LaNiO3 buffer layers can significantly increase the tunability of BST solid solutions prepared on Si‐based substrates, which is in line with the estimated rule. This law offers a guide for choosing the best substrate and buffer layer when producing BST films with strong dielectric response.

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The influence of interface on the dielectric and tunable properties of BCZT/BZT ceramic

Yang,

Zhao,

Shi

et al. 2024

J Mater Sci: Mater Electron

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Design and Characterization of Novel Barium Strontium Titanate Thick Films for Sub-6 GHz RF Applications

Cited by 8 publications

References 35 publications

Low-Temperature Dielectric Response of Strontium Titanate Thin Films Manipulated by Zn Doping

Low-Temperature Dielectric Response of Strontium Titanate Thin Films Manipulated by Zn Doping

Optimized Tunability of Barium Strontium Titanate Thin Films onto Different Plates with Proper Buffer Layers

The influence of interface on the dielectric and tunable properties of BCZT/BZT ceramic

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