Localized Black Polyimide Absorbers for Low-Reflectance Ag Metal Mesh Electrodes

Engineering notes

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Chinese explanation / 中文解读

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Original abstract

Flexible transparent conducting electrodes based on metal mesh structures can achieve low sheet resistance but often exhibit visible reflection from the metallic lines. Here, we introduce a localized black polyimide (BPI) light absorption layer near the Ag mesh lines to reduce metal-induced reflection while preserving the essential electrode characteristics. The BPI layer, consisting of carbon-black-dispersed polyimide, was patterned by combining thermal imprinting with Ag nanoparticle ink filling, thermal treatment, and selective etching, thereby localizing the light-absorption layer near the Ag mesh lines. At 550 nm, the localized BPI layer reduced the reflectance of the Ag electrode region from 50.22% to 4.94%, corresponding to a 90.16% reduction. Because the BPI layer was selectively self-positioned at the reflective metal-line region, this local reduction in reflectance provides a structural route to reducing the visibility of metal mesh electrodes. The fabricated electrode maintained transparent-electrode characteristics, with only a limited change in sheet resistance after selective etching and repeated bending.

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