Simultaneously achieved high-energy storage density and efficiency in (K,Na)NbO3-based lead-free ferroelectric films |
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Authors: | Yu Huang Liang Shu Suwei Zhang Zhen Zhou Yue-Yu-Shan Cheng Biaolin Peng Lisha Liu Yuanyuan Zhang Xuping Wang Jing-Feng Li |
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Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;2. School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, China;3. Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China |
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Abstract: | With the development of advanced electrical and electronic devices and the requirement of environmental protection, lead-free dielectric capacitors with excellent energy storage performance have aroused great attention. However, it is a great challenge to achieve both large energy storage density and high efficiency simultaneously in dielectric capacitors. This work investigates the energy storage performance of sol-gel-processed (K,Na)NbO3-based lead-free ferroelectric films on silicon substrates with compositions of 0.95(K0.49Na0.49Li0.02)(Nb0.8Ta0.2)O3-0.05CaZrO3-x mol% Mn (KNN-LT-CZ5-x mol% Mn). The appropriate amount of Mn-doping facilitates the coexistence of orthorhombic and tetragonal phases, suppresses the leakage current, and considerably enhances the breakdown strengths of KNN-LT-CZ5 films. Consequently, large recoverable energy storage density up to 64.6 J cm?3 with a high efficiency of 84.6% under an electric field of 3080 kV cm?1 are achieved in KNN-LT-CZ5-5 mol% Mn film. This, to the best of our knowledge, is superior to the majority of both the lead-based and lead-free films on silicon substrates and thus demonstrates great potentials of (K,Na)NbO3-based lead-free films as dielectric energy storage materials. |
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Keywords: | dielectric capacitors energy storage lead-free films sol-gel |
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