Low-temperature solution processing route for potassium sodium niobate (KNN) thin films

Pinho, Rui; Bretos, Íñigo; Jiménez, Ricardo; Calzada, M. L.; Hortigüela, María J.; Otero‐Irurueta, Gonzalo; Ivanov, Maxim; Tkach, Alexander; Costa, Maria Elisabete V.; Vilarinho, Paula M.

doi:10.1016/j.jeurceramsoc.2023.03.036

Cited by 2 publications

(1 citation statement)

References 40 publications

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“…To verify whether the observed phenomenon is specific to certain process conditions, we also conducted XRD analysis on the three KNN thin-film structures annealed at the temperature of 650, 700, 750, and 800 °C. Temperature is one of the most crucial influencing factors in thin film fabrication process, as it strongly affects the microstructure and performance characteristics of the films. ,, Therefore, in this study, the impact of the annealing temperature on the films is illustrated by using it as a representative variable. XRD analysis, as depicted in Figure , clearly demonstrates that at various temperatures, the KNN film with alternating e-KNN and o-KNN layers exhibits a superior crystalline structure and higher (100) preferred orientation compared to the o-KNN and e-KNN films.…”

Section: Results and Discussionmentioning

confidence: 99%

Alternating Spin-Coating Sol–Gel Synthetic Route for Highly (100)-Textured Potassium Sodium Niobate Films

Zhang,

Yao,

Wang

et al. 2024

Crystal Growth & Design

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This study introduces a novel sol−gel synthesis route that combines the metal alkoxide and nonalkoxide methods to synthesize highly preferentially oriented potassium sodium niobate (KNN) films. In this approach, C 10 H 25 NbO 5 and Nb 2 O 5 are used as niobium sources to synthesize KNN sols, which are then alternately spin-coated to form the desired KNN film (referred to as e-KNN/o-KNN). Pure C 10 H 25 NbO 5 source KNN film (e-KNN) and pure Nb 2 O 5 source KNN film (o-KNN) are also synthesized as control samples. As expected, alternating spincoating facilitates the enhancement of (h00)-preferred orientation and crystallinity, and both were superior to the KNN film with alternating e-KNN and o-KNN layers compared with the two pure KNN films. Interestingly, variations in annealing temperature do not affect the crystalline characteristics of these three types of KNN films, indicating that the synthesis route plays a predominant role in determining the microstructural characteristics. Furthermore, the dielectric response and optical properties of KNN films can also be precisely tailored through the synthesis route. For instance, using Nb 2 O 5 as a niobium source can significantly enhance the dielectric constant of KNN films, whereas substituting C 10 H 25 NbO 5 for Nb 2 O 5 can effectively accelerate the dielectric polarization speed of KNN films, thereby reducing their high-frequency dielectric losses. This research provides new insights and significant guidance for tailoring the sol−gel synthesis, microstructural characteristics, and performance of KNN films.

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Section: Results and Discussionmentioning

confidence: 99%

Alternating Spin-Coating Sol–Gel Synthetic Route for Highly (100)-Textured Potassium Sodium Niobate Films

Zhang,

Yao,

Wang

et al. 2024

Crystal Growth & Design

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Tailored Lead-Free KNN/BFO Perovskite Ferroelectric Film Heterostructures for Enhanced Electrofunctional Properties via Interface-Modulated Bilayer Design

Zhang,

Peng,

et al. 2024

Langmuir

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In this work, a bilayer lead-free perovskite ferroelectric structure was fabricated comprising a highly polar BiFeO 3 (BFO) bottom layer and a less polar (K 1−x Na x )NbO 3 (KNN) top layer. The BFO sublayer, deposited via radio frequency magnetron sputtering without postgrowth annealing, not only exhibited enhanced crystallinity but also promoted superior microstructural properties in the sol-gel derived KNN overlayer, thereby ensuring excellent intrinsic electrical properties. Compared to the poorly crystallized single-layer KNN films directly synthesized on LNObuffered (100)-Si substrate, the KNN layer in the bilayer structure demonstrated a strong (100) texture, along with a dense, homogeneous, fine-grained morphology. The bilayer design effectively balances the limited polarization of single-layer KNN and the weak dielectric response of single-layer BFO. Furthermore, variations in BFO sublayer thickness reveal that the KNN/BFO stacking configuration and interface characteristics play a crucial role in tailoring the electrical properties, even surpassing the intrinsic contributions of the individual layers. The presence of the BFO layer enhanced the unsaturated polarization in the KNN film, with a more pronounced effect as the BFO thickness increased. The dielectric constant of the KNN/BFO bilayer consistently fell between those of the two single-layer structures and decreased with increasing BFO thickness, contrary to the trend observed in single-layer BFO. These results underscore the complex interactions among intrinsic properties, stacking configurations, and interface coupling in lead-free ferroelectric films, providing insights for future heterostructure design strategies.

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Low-temperature solution processing route for potassium sodium niobate (KNN) thin films

Cited by 2 publications

References 40 publications

Alternating Spin-Coating Sol–Gel Synthetic Route for Highly (100)-Textured Potassium Sodium Niobate Films

Alternating Spin-Coating Sol–Gel Synthetic Route for Highly (100)-Textured Potassium Sodium Niobate Films

Tailored Lead-Free KNN/BFO Perovskite Ferroelectric Film Heterostructures for Enhanced Electrofunctional Properties via Interface-Modulated Bilayer Design

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