Laser‐Induced Transient Self‐Organization of TiNx Nano‐Filament Percolated Networks for High Performance Surface‐Mountable Filter Capacitors

• Published in: Advanced materials (Weinheim) 2023-04, Vol.35 (15), p.n/a
• Main Authors: Wang, Fangcheng, Guo, Zhenbin, Wang, Zhiyuan, Zhu, Haojie, Zhao, Guangyao, Chen, Chaojie, Liu, Mingjie, Sun, Rong, Kang, Feiyu, Wong, Ching‐Ping, Yang, Cheng
• Format: Article
• Language: English
• Subjects: Aluminum; Aqueous electrolytes; Controllability; Digital electronics; Electrode materials; Electrodes; Electrolytic capacitors; Electronic devices; Filaments; Lasers; laser‐induced transient self‐organization; Materials science; Nanostructure; Pulsed lasers; surface‐mountable filter capacitors; TiN x nanonetworks; Titanium nitride; ultrafine nano‐filaments; Ultrafines
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.202210038

Filter capacitors (FCs) are substantial for digital circuits and microelectronic devices, and thus more compact FCs are eternally demanded for system miniaturization. Even though microsupercapacitors are broadly regarded as an excellent candidate for future FCs, yet due to the limitation of available electrode materials, the capacitive performance of reported MSCs drops sharply under high‐frequency alternating current. Herein, we present a unique laser‐induced transient self‐organization strategy, which synergizes pulsed laser energy and multi‐physical field controlled coalescence processes, leading to the rapid and controllable preparation of titanium nitride ultrafine nano‐filaments (diameter ≈3–5 nm) networks. Their chaotic fractal nanoporous structure, superior specific surface area, and excellent conductivity render these nanostructures promising candidates for FCs. Surface‐mounted filter capacitors based on this electrode material exhibit ultra‐long cycle‐life (2 000 000 cycles) with record ultrahigh volumetric energy density of 9.17 mWh cm−3 at 120 Hz in aqueous electrolyte, displaying advantages in function, size, and integrability compared with the state‐of‐the‐art aluminum electrolytic capacitors. The method here provides a versatile toolbox for designing novel nanostructures with intriguing characteristics and insights for developing advanced and miniaturized filter and power devices. Preparing low‐dimensional conductive nitride‐based hierarchical structures with sub‐10 nm geometric characteristics has been a major challenge. A unique laser‐induced transient self‐organization strategy to rapidly and controllably fabricate ultrafine (diameter: 3–5 nm) TiNx nano‐filament percolated chaotic fractal networks is presented. The prepared surface‐mountable filter capacitors achieve a record‐breaking volumetric energy density of 9.17 mWh cm−3 at 120 Hz in an aqueous electrolyte.