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Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh
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High-performance electrochromic films with fast switching times using transparent/conductive nanoparticle-modulated
Junsang Yun1, Yongkwon Song, Ikjun Cho
1Department of Chemical & Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea. jinhan71@korea.ac.kr.
Nanoscale
|September 26, 2019
Summary
High-performance electrochromic (EC) films with improved charge transfer were created using tungsten oxide nanorods and indium tin oxide nanoparticles. This structural design significantly enhances EC performance and switching speeds.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Electrochromic (EC) films, particularly those based on transition metal oxides like tungsten oxides (WOx), face challenges with poor charge transfer, limiting their performance.
- Efficient charge transport is crucial for optimizing the switching speeds and optical modulation of EC devices.
Purpose of the Study:
- To enhance the charge transfer properties and overall performance of electrochromic films.
- To develop a novel method for fabricating high-performance EC films using nanocomposite structures.
Main Methods:
- Layer-by-layer (LbL) assembly of oleylamine (OAm)-stabilized WO2.72 nanorods (NRs) and OAm-stabilized indium tin oxide (ITO) nanoparticles.
- Utilizing small-molecule linkers (tris(2-aminoethyl)amine, TREN) via ligand-exchange reactions to minimize separation distances between inorganic components.
- Incorporating transparent and conductive ITO nanoparticles within the WO2.72 NR matrix.
Main Results:
- Minimized separation distance between inorganic components by using TREN linkers.
- Periodic insertion of ITO nanoparticles significantly reduced charge transfer resistance.
- EC films with ITO NPs showed 4.1x faster coloration and 3.5x faster bleaching times.
- Achieved a maximum optical modulation of approximately 55.8%.
Conclusions:
- Structural and interfacial engineering of nanocomposites is an effective strategy to improve EC performance.
- The developed LbL assembly method with ITO NPs offers a promising route for high-performance electrochromic devices.
- Reduced charge transfer resistance is key to enhanced electrochemical and EC performance.
