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Updated: May 30, 2025
A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
Nanostructured Quasiplanar Heterointerface for a Highly Stable and Ultrafast Switching Flexible Inorganic
Pan Li1,2, Xiaoxin Liu1, Ying Lv1
1Key Laboratory of Luminescence Science and Technology, Chinese Academy of Sciences & State Key Laboratory of Luminescence Science and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
Abstract:
Electrochromic (EC) technology can adjust optical properties under electrical stimulation with broad applications in smart windows, displays, and camouflage. However, significant challenges remain in developing inorganic EC films with high durability, rapid response, and mechanical flexibility due to intrinsic brittleness and dense microstructure. Herein, a nanostructured quasiplanar heterointerface (Q-PHI) is first introduced into the electrode/EC interlayer to realize a robust, ultrafast switching tungsten trioxide (WO3) EC film. The 200 nm-thick Q-PHI WO3 film exhibits remarkable EC performance, including large optical contrast (81.8% and 83.4% at 700 and 1500 nm), ultrafast switching of 2.4 and 1.8 s, and excellent stability (10,000 cycles with 21.3% optical-contrast loss). A large-area (20 × 15 cm2) flexible EC smart window is also successfully achieved. The mechanism lies in the intense built-in electric field and strong interfacial bonding induced by the Q-PHI with unique longitudinal gradient distribution, greatly enhancing the electron/ion transport kinetics, surface ion adsorption, and durability.
