Design of fatigue-damage-free thin film electrode on polymer substrate by implementing hybrid nanostructure

Design of fatigue-damage-free thin film electrode on polymer substrate by implementing hybrid nanostructure
Hybrid; Nanostructure; Si anode
Issue Date
TACT international conference
Design and fabrication of reliable electrodes subject to repeated deformation is one of the most important challenges in flexible devices since mechanical and electrical properties of devices degrade gradually because of fatigue damage. Here, we introduce two unique nanostructure designs for flexible thin film electrodes on a polymer substrate to suppress fatigue crack damage during cyclic bending. First, a fatigue damage-free flexible metal electrode was developed. Through systematic investigation, we found that the resistivity change of metal thin film after crack nucleation could be scaled using a dimensional analysis with respect to crack nucleation cycles, which indicates that controlling the crack nucleation would be crucial against fatigue damage [1]. To suppress crack nucleation, we introduced a novel nanostructured fatigue damage-free copper electrode on flexible substrate by creating 2-D nanohole arrays [2]. The arrayed nanoholes control the collective dislocation slips and decrease the average strain level so that electrical conductivity of nanohole-containing electrodes surprisingly maintained even under 500,000 bending cycles whereas that of untreated conventional copper increase by three times under the same condition. Secondly, we developed a polymer nanofiber/TiO2 nanoparticle composite photo-electrode with high bendability by a spray-assisted electro-spinning method [3]. The composite film structure similar to that of a fiber-reinforced composite is used as the photo-electrode in plastic dye-sensitized solar cells (DSCs). Compared to conventional DSCs, composite-based DSCs show outstanding bending stability because the polymer nanofibers prevent delamination of the electrode by relieving the external stress and effectively retarding crack generation and propagation.
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