Metallic Grid Electrode Fabricated via Flow Coating for High-Performance
Flexible Piezoelectric Nanogenerators
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Abstract
Transparent conducting electrodes
(TCEs) based on metallic grid structures have been extensively explored
for use in flexible and transparent electronics according to their
excellent conductivity and flexibility. Previous fabrication methods
have been limited by the complexity and expense of their processes.
Here, we have introduced a simple and cost-effective flow-coating
method for preparing flexible and transparent metallic grid electrodes
using silver nanoparticles (AgNPs). The process comprises only two
steps, including patterning and sintering the horizontal AgNPs lines,
followed by patterning and sintering the longitudinal AgNPs lines.
The grid width could be easily controlled by varying the concentration
of the AgNP solution and the grid spacing could be controlled by varying
the distance moved by a translation stage between intermittent stops.
The optimized Ag grid electrode exhibited an optical transmittance
at 550 nm of 86% and a sheet resistance of 174 Ω/sq. The resulting
Ag grid electrodes were successfully used to prepare a flexible piezoelectric
nanogenerator. This device showed good performance, including an output
voltage of 5 V and an output current density of 0.5 μA/cm<sup>2</sup>