Flexible Perovskite Solar Cells Using Commercially Viable Metal Foils
Jenny Baker a, James McGettrick a, Joel Troughton a, Trystan Watson a, Daniel Bryant a b
a SPECIFIC, Swansea University, Baglan Bay Innovation and Knowledge Centre, Baglan, SA12 7AX, United Kingdom
b Imperial College London, United Kingdom, South Kensington, Londres, Reino Unido, United Kingdom
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Swansea, United Kingdom, 2016 June 29th - July 1st
Organizers: James Durrant, Henry Snaith and David Worsley
Poster, Joel Troughton, 123
Publication date: 28th March 2016

During the short time since their discovery, organic-inorganic halide perovskites have exploded in popularity as promising light harvesters for photovoltaic devices with published power-conversion efficiencies (PCEs) now exceeding 21%. While the majority of research in the field employs fluorine-doped tin oxide (FTO) coated glass, the bulk associated with glass makes roll-to-roll upscaled production inherently difficult. Tin-doped indium oxide (ITO) coated polymer substrates have also been investigated but suffer from mechanical fragility and uncertain materials costs as a result of indium’s volatile price. Metallic substrates offer a scalable, low-cost and robust alternative to such transparent conducting oxides (TCOs). Previous processing methods carried out on titanium metal foils as substrates produced efficiencies in excess of 10%, however such methods may not be applicable to lower-cost metals such as steels owing to detrimental surface oxidation from high temperature sintering treatments.

In this work, we present flexible perovskite solar cells using very low cost, commercially viable metallic substrates. By reducing processing temperatures, we are able to produce efficient devices on flexible metal foils including steel, nickel and zinc, which would otherwise be unavailable due to thermal oxidation. We examine the interaction between metal substrate, thermally evolved oxide and photovoltaic active layers using XPS in order to highlight the requirement for low temperature processing. In addition, we present relatively large active-area cells fabricated using scalable printing techniques which offer routes to the eventual commercialisation of such devices.



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