Solution-Processed Metal Nanowire Mesh Transparent Electrodes

Solution-Processed Metal Nanowire Mesh Transparent Electrodes

2008 | Jung-Yong Lee, Stephen T. Connor, Yi Cui, and Peter Peumans
This paper presents a solution-processed transparent electrode made of metal nanowire meshes that outperforms traditional metal-oxide transparent electrodes in terms of optical transparency and electrical conductivity. The electrode is composed of randomly arranged metal nanowires, which provide a high level of optical transparency while maintaining a low sheet resistance. The study shows that these nanowire meshes can be fabricated using a solution-based process, making them cost-effective and suitable for flexible substrates. The research demonstrates that the optical transmission and sheet resistance of subwavelength periodic metal gratings are superior to those of indium tin oxide (ITO), a commonly used transparent electrode. The nanowire meshes were found to have a solar photon flux-weighted transmissivity of up to 85% for a sheet resistance of 10 Ω/sq, which is comparable to or better than that of ITO. Additionally, these electrodes can be bent to a radius of 4 mm without affecting their electrical properties. The nanowire meshes were fabricated by casting suspensions of solution-synthesized metal nanowires on a substrate. The resulting films are random meshes of Ag nanowires without significant bundling. Annealing the meshes at 200°C reduces the sheet resistance significantly, from over 1 kΩ/sq to approximately 100 Ω/sq. The performance of the nanowire meshes was evaluated using organic photovoltaic cells, which showed improved photocurrents compared to cells fabricated on ITO-coated substrates. The study concludes that solution-processed metal nanowire mesh electrodes are an attractive alternative to traditional metal-oxide transparent electrodes due to their high optical transparency, low sheet resistance, and compatibility with flexible substrates. These electrodes have the potential to be used in a wide range of applications, including organic solar cells, due to their low cost and ease of fabrication.This paper presents a solution-processed transparent electrode made of metal nanowire meshes that outperforms traditional metal-oxide transparent electrodes in terms of optical transparency and electrical conductivity. The electrode is composed of randomly arranged metal nanowires, which provide a high level of optical transparency while maintaining a low sheet resistance. The study shows that these nanowire meshes can be fabricated using a solution-based process, making them cost-effective and suitable for flexible substrates. The research demonstrates that the optical transmission and sheet resistance of subwavelength periodic metal gratings are superior to those of indium tin oxide (ITO), a commonly used transparent electrode. The nanowire meshes were found to have a solar photon flux-weighted transmissivity of up to 85% for a sheet resistance of 10 Ω/sq, which is comparable to or better than that of ITO. Additionally, these electrodes can be bent to a radius of 4 mm without affecting their electrical properties. The nanowire meshes were fabricated by casting suspensions of solution-synthesized metal nanowires on a substrate. The resulting films are random meshes of Ag nanowires without significant bundling. Annealing the meshes at 200°C reduces the sheet resistance significantly, from over 1 kΩ/sq to approximately 100 Ω/sq. The performance of the nanowire meshes was evaluated using organic photovoltaic cells, which showed improved photocurrents compared to cells fabricated on ITO-coated substrates. The study concludes that solution-processed metal nanowire mesh electrodes are an attractive alternative to traditional metal-oxide transparent electrodes due to their high optical transparency, low sheet resistance, and compatibility with flexible substrates. These electrodes have the potential to be used in a wide range of applications, including organic solar cells, due to their low cost and ease of fabrication.
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[slides and audio] Solution-processed metal nanowire mesh transparent electrodes.