Download file (1.02MB)
Download as zip (1000KB)

コレクション

引用

説明:

Electrochromic (EC) materials and devices (ECDs) have been extensively studied, providing valuable insight into their optical switching properties and material characteristics. To analyse dynamic and subtle spatial variations during switching, we developed for the first time a non-invasive, automated, image-based methodology capable of resolving EC behavior at the pixel level. Grayscale images, extracted from video recordings at 0.0333 s intervals during cyclic operation, were segmented into 8,448 localized pixel positions to quantify contrast–time profiles. Firstly, switching non-uniformity was visualized, revealing reaction times from 0.8 to 2.0 s to reach 90% contrast change, with faster responses at the edges and slower transitions in the center. Secondly, segmental kinetics were evaluated by fitting time constants (τ) to each profile and linking them to composite resistances using a simplified RC model with a uniform areal capacitance (0.0133 F cm⁻2). The edge segment exhibited lower τ (1.79) and resistance (134.5 Ω·cm2), whereas the central pixel position showed delayed switching (1.80 s) with larger τ (2.46) and higher resistance (184.9 Ω·cm2). Finally, spatial distributions were visualized through 2D heat maps, confirming slower central regions (1.60-1.95 s), with regional average resistance 185.7 Ω·cm2 compared to lower-resistance peripheral regions (136.8–149.6 Ω·cm2). This non-invasive approach enables high-resolution diagnostic platform for quantifying uniformity, kinetics, and resistance distributions in large-area ECDs and is broadly applicable to diverse EC architectures influenced by spatial transport effects.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Electrochromic device

刊行年月日: 2025-12-09

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Applied Electronic Materials (ISSN: 26376113) vol. 7 issue. 23 p. 10651-10663

研究助成金:

• JST-Mirai Program JPMJMI21I4
• Environmental Restoration and Conservation Agency JPMEERF20221M02

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acsaelm.5c01754

関連資料:

その他の識別子:

連絡先:

更新時刻: 2026-01-07 10:31:36 +0900

MDRでの公開時刻: 2026-01-07 12:22:00 +0900