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Flexible and transparent electrodes imprinted from metal nanostructures: morphology and opto-electronic performance

  • We directed the self-assembly of nanoscale colloids via direct nanoimprint lithography to create flexible transparent electrodes (FTEs) with metal line widths below 3 μm in a roll-to-roll-compatible process. Gold nanowires and nanospheres with oleylamine shells were imprinted with soft silicone stamps, arranged into grids, and converted into metal lines in a plasma process. We studied the hierarchical structure and opto-electronic performance of the resulting grids as a function of particle geometry and concentration. The performance in terms of optical transmittance was dominated by the line width. Analysis of cross-sections indicated that plasma sintering only partially removed the insulating ligands and formed lines with thin conductive shells and a non-conductive core. We provide evidence that the self-assembly of high-aspect nanowires can compensate for defects of the stamp and substrate irregularities during imprinting, while spheres cannot. The wire-based electrodes thus outperformed the sphere-based electrodes at ratios of optical transmittance to sheet resistance of up to ≈ 0.9 %·Ωsq-1, while spheres only reached ≈ 0.55 %·Ωsq-1.

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Document Type:Article
Author:Lukas F. EngelORCiD, Lola Gonzalez-GarciaORCiD, Tobias KrausORCiD
Parent Title (English):Nanoscale Advances
First Page:3370
Last Page:3380
Year of first Publication:2022
Release Date:2022/08/25
Impact:05.598 (2021)
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2022/064
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International