Effect of Mn Doping and Niobium Oxide Seed Layer on Electrical Properties of Potassium Sodium Niobate Thin Films

doi:10.11901/1005.3093.2021.355

Chinese Journal of Materials Research

2022, Vol. 36

Issue (12): 945-950 DOI: 10.11901/1005.3093.2021.355

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Effect of Mn Doping and Niobium Oxide Seed Layer on Electrical Properties of Potassium Sodium Niobate Thin Films

ZHU Haiyong¹^,²(

), ZHANG Wei³

^1.State Key Laboratory of Transducer Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
^2.Key Laboratory of Infrared Imaging Materials and Detectors, Chinese Academy of Sciences, Shanghai 200083, China
^3.College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Cite this article:

ZHU Haiyong, ZHANG Wei. Effect of Mn Doping and Niobium Oxide Seed Layer on Electrical Properties of Potassium Sodium Niobate Thin Films. Chinese Journal of Materials Research, 2022, 36(12): 945-950.

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Abstract

High-quality films of lead-free piezoelectric xMn-doped KNaNbO₃ (x = 0, 0.05, 0.10) were successfully deposited onto Pt(111)/Ti/SiO₂/Si(100) substrates by sol-gel method. The effect of Mn doping and seed layer of niobium oxide on the microstructure, dielectric properties, ferroelectric properties, and leakage current of the KNN films was investigated in detail. The results show that Mn doping can significantly improve the ferroelectric properties and reduce the leakage current of the prepared films. After inserted a seed layer of niobium oxide in between the films and the substrate, the leakage current related mechanism of KNN films changes from space charge conduction and ohmic conduction to ohmic conduction and Schottky emission, correspondingly, the leakage current is further reduced. It is found that when the electric field is 600 kV/cm, the maximum polarization value of the 10% mol Mn doped KNN films with a inserted seed layer is 20.33 μC/cm², and the residual polarization value is 2.94 μC/cm².

Key words: inorganic non-metallic materials energy storage performance sol-gel potassium sodium niobate films

Received: 15 June 2021

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.355 OR https://www.cjmr.org/EN/Y2022/V36/I12/945

Fig.1 XRD spectra of KNN films

Fig.2 SEM images of the films (a) KNN films; (b) 5%Mn-KNN films; (c) NbO/5%Mn-KNN films; (d) KNN films section

Fig.3 Dielectric constant and loss tangent of KNN films

Fig.4 Hysteresis loop of KNN films (a), 5% Mn-KNN films (b), NbO/5% Mn-KNN films (c), 10% Mn-KNN films (d), NbO/10% Mn-KNN films (e) and Maximum polarization value and residual polarization value of the films in 200 kV/cm (f)

Fig.5 Leakage current density (J) as a function of the applied electric field (E) for the KNN films (a) and ln(J)-ln(E) characteristics of KNN，5%Mn-KNN，NbO/5%Mn-KNN films (b)

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