Spectral-Filtering Compact Film Structure Featuring Ultralow Electrical Resistivity

• Published in: ACS photonics 2024-06, Vol.11 (6), p.2430-2438
• Main Authors: Gao, Haiqi, Shao, Yu, Lin, Jie, Wang, Yiming, Wen, Junren, Zhu, Yining, Zheng, Xiangjun, Wu, Han, He, Haidong, Liang, Tao, Shao, Yuchuan, Zhang, Yueguang, Shen, Weidong, Yang, Chenying
• Format: Article
• Language: English
• ISSN: 2330-4022; 2330-4022
• DOI: 10.1021/acsphotonics.4c00328

The development of colored electrodes has significant implications for various applications, offering an enhanced blend of aesthetics and functionality across multiple fields. Traditional approaches to achieving this, such as altering material composition, modifying carrier density, and applying surface treatments or micro-nano structures, face challenges in terms of complexity and manufacturing costs. This study introduces an innovative, high-conductivity electrode design capable of flexibly controlling the reflective spectra. We have successfully fabricated various flexible colored devices characterized by high brightness and saturation through a room-temperature preparation process, exhibiting remarkably low electrical resistance of approximately 300 mΩ/sq. The construction of the asymmetrical Fabry–Perot resonance cavity, composed of a four-layer compact film stack, enables the enhancement or suppression of specific light wavelengths, facilitating efficient spectral filtering with conductive dielectric and metals. Moreover, the electrode exhibits remarkable bending properties, maintaining conductivity and color integrity even after 5000 bending cycles and at high curvatures (up to 90 m–1), a feature attributed to its ultrathin structure (