Thermal cycling-induced nitriding increases energy-storage density in titanate ferroelectric films

• 成果类型: Article
• 署名作者: Yi, Jiaojiao; Zhong, Kangyu; Shen, Chen; Zhai, Yining; Sun, Lu; Zhang, Hongbin; Song, Zizheng; Chen, Zibin; Damjanovic, Dragan; Li, Jing-Feng; Zhang, Shujun; Liu, Lisha
• 署名单位: Jiangsu University of Technology; Nanjing University of Science & Technology; Technical University of Darmstadt; Hong Kong Polytechnic University; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Tsinghua University; City University of Hong Kong; City University of Hong Kong
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.aeb5274
• 发表日期: 2026-08-27
• 页码: 923-930
• 关键词: METALLIC GLASSES; titanium; nitrogen; srtio3

摘要

Enhancing dielectric energy-storage density (Ue) requires maximizing the difference between maximum and remanent polarizations (Delta P). Improving Delta P remains fundamentally challenging, as existing strategies rarely achieve simultaneous high maximum polarization and low remanent polarization. We introduce a postsynthesis treatment method, cryogenic thermal cycling, in which liquid nitrogen infiltrates the film and then is rapidly cycled to 100 degrees C. This process markedly increases Delta P to 105 microcoulombs per square centimeter in oxide ferroelectric titanate films through oxygen vacancy-mediated nitrogen hybridization. Using this approach, we increased Ue to 261 joules per cubic centimeter with an efficiency approaching 80%. This approach is broadly applicable to diverse film materials with thicknesses spanning the nano- to microscale, offering a facile and cost-effective route to overcoming the critical bottleneck in Delta P and Ue.