High Performance Transparent Embedded-Silver Grid Electrodes for Organic Photovoltaics Fabricated by Selective Metal Condensation
Philip Bellchambers a, Charlie Henderson a, Keun-Woo Park b, Jin-Kyun Lee b, Ross Hatton a
a Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
b Department of Polymer Science and Engineering, Inha University, Incheon 22212, South Korea
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Philip Bellchambers, presentation 109
DOI: https://doi.org/10.29363/nanoge.hopv.2022.109
Publication date: 20th April 2022

This talk will present recent progress in the development of a new way to fabricate high performance transparent silver grid electrodes matched to the needs of organic photovoltaics: The electrodes have an average far-field transparency of 88%, a sheet resistivity of 6 ohm/sq, low (tuneable) surface roughness and can be fabricated on flexible plastic as well as glass. Electrodes of area 25 cm2 exhibit a less than 5% change in sheet resistance after 100,000 bending cycles through a radius of curvature of 6 mm. The silver grid is fabricated using a new iteration of a novel approach to patterning metal films developed in the Hatton laboratory, based on selective metal deposition by condensation coefficient modulation.[1,2] Using this approach embedded silver grid electrodes with micron-sized linewidth are realised, which is more than 10 times narrower than can be achieved using the conventional printing techniques of screen, inject and flexographic printing. This novel approach to grid electrode fabrication removes the need for harmful metal etchants and slow, chemical intensive electrochemical deposition steps. A performance of 10% power conversion efficiency in model OPV devices using these electrodes is comparable to that achieved using a conventional ITO coated glass electrode.

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