title: Asymmetric Pentagonal Metal Meshes for Flexible Transparent Electrodes and Heaters.
abstract: Metal meshes have emerged as an important class of flexible transparent electrodes. We report on the characteristics of a new class of asymmetric meshes, tiled using a recently discovered family of pentagons. Micron-scale meshes were fabricated on flexible polyethylene terephthalate substrates via optical lithography, metal evaporation (Ti 10 nm, Pt 50 nm), and lift-off. Three different designs were assessed, each with the same tessellation pattern and line width (5 μm), but with different sizes of the fundamental pentagonal unit. Good mechanical stability was observed for both tensile strain and compressive strain. After 1000 bending cycles, devices subjected to tensile strain showed fractional resistance increases in the range of 8-17%, while devices subjected to compressive strain showed fractional resistance increases in the range of 0-7%. The performance of the pentagonal metal mesh devices as visible transparent heaters via Joule heating was also assessed. Rapid response times (∼15 s) at low bias voltage (≤5 V) and good thermal resistance characteristics (213-258 °C cm2/W) were found using measured thermal imaging data. Deicing of an ice-bearing glass coupon on top of the transparent heater was also successfully demonstrated.
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Daniel
authors.initials: D
authors.lastname: Lordan
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Micheal
authors.identifier: http://orcid.org/0000-0003-1831-8829
authors.initials: M
authors.lastname: Burke
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Mary
authors.initials: M
authors.lastname: Manning
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Martin
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Andreas
authors.initials: A
authors.lastname: Amann
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Dan
authors.initials: D
authors.lastname: O'Connell
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Richard
authors.initials: R
authors.lastname: Murphy
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Colin
authors.initials: C
authors.lastname: Lyons
authors.affiliation: Tyndall National Institute, University College Cork , Lee Maltings Complex, Dyke Parade, Cork, Ireland.
authors.forename: Aidan J
authors.identifier: http://orcid.org/0000-0003-4021-9990
authors.initials: AJ
authors.lastname: Quinn
keywords: PET; asymmetric; metal mesh; pentagon; polyethylene terephthalate; transparent flexible electrode; transparent heaters