High-Performance Cu Mesh Transparent Conductive Electrodes for Flexible Organic Photovoltaics
Philip Bellchambers a, Silvia Varagnolo a, Ross Hatton a
a Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Oral, Philip Bellchambers, presentation 121
DOI: https://doi.org/10.29363/nanoge.hopv.2019.121
Publication date: 11th February 2019

There is a clear need for a new transparent electrode compatible with flexible organic photovoltaics (OPVs) and made from low-cost raw materials. This talk will present a high-performance copper (Cu) electrode based on a Cu grid fabricated by soft lithography and demonstrate its utility in PV devices with ~10% efficiency. Even before the addition of an anti-reflecting charge transport layer the electrode has an average far field transparency of ≥ 85% which is achieved for a sheet resistance < 10 Ω sq-1. The novelty of the fabrication process is twofold: (i) an extremely rapid and clean metal etch process using a low toxicity etchant (ii) an ultrathin mask which can remain in place after etching without consequence, which together speed up and simplify electrode fabrication and integration into OPV devices. At ~1% the material cost of comparable Ag-mesh electrodes, we show these electrodes can compete with indium tin oxide (ITO) as the transparent electrode in high-performance OPVs with further advantages through their inherent flexibility.

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