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[14a-PB6-17] Improvement of cyclic bending durability of printed Ag wirings using different-shaped Ag fillers
Keywords:flexible device, printed electronics, cyclic bending durability
Flexible wirings fabricated on plastic films play a significant role in bendable and foldable devices. In these applications, excellent bending reliability is required for flexible wirings. We have examined bending reliability of printed silver wirings with different kinds of filler shapes in pastes: One paste includes spherical fillers (paste A) and another includes flake-shape fillers (paste B). These pastes were printed on polyethylene naphthalate films by screen printing and their bending durability was examined by cyclic bending tests. In the result, the flake-shape one exhibited much higher durability than the one with spherical fillers. Furthermore, mixing 30 % paste B to paste A improved the bending durability greatly. We consider the difference of the bending durability is attributed to the adhesiveness of fillers each other and fillers-to-substrates.