Transparent copper grid electrodes for perovskite photovoltaics
Anjana Wijesekara a, Ross Hatton a
a Department of Chemistry, University of Warwick, Coventry, CV4 7AL
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Poster, Anjana Wijesekara, 041
Publication date: 25th November 2019

Photovoltaic devices that use metal halide perovskites as the light harvesting layer have strong potential to be both flexible and low cost. However, this potential can only be fully realised if the indium tin oxide (ITO), or fluorine doped tin-oxide (FTO), glass electrode currently used to let light into these devices is replaced with a low cost, flexible alternative. The major challenge of shifting from ITO and FTO electrodes to transparent electrodes based on metal grids is the chemical incompatibility of the most conductive metals, silver and copper, to the iodine-containing compounds used to synthesise narrow bandgap perovskites, and the iodine-containing perovskite degradation products that inevitably eventually form. This talk will present the results of experiments designed to test the suitability of high performance transparent copper grid electrodes in lead-free perovskite photovoltaics devices with the architecture; Cu grid electrode |poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)|FA0.78GA0.20SnI3|C60|Bathocuprine| Al.1 The copper grid electrode is fabricated by micro-contact printing, which enables copper line-widths of < 1.5 microns, which is an order of magnitude lower than can be achieved using conventional printing methods. This electrode offers a transparency of ≥ 80% together with a sheet resistance of ≤ 5.0 Ω/sq which makes it competitive with ITO and FTO coated glass and plastic. The findings presented are expected to be equally applicable to lead perovskite photovoltaics, and bode well for the prospect of using copper grids as the substrate electrode in perovskite photovoltaics.

 University of Warwick for providing a Chancellors’ International PhD Scholarship.

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