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ArticleThis paper presents the novel use of spray coating to fabricate organic solar cells on fabrics for wearable energy harvesting applications. The surface roughness of standard woven 65/35 polyester cotton fabric used in this work is of the order of 150 µm and this is reduced to few microns by a screen printed interface layer. This pre-treated fabric substrate with reduced surface roughness was used as the target substrate for the spray coated fabric organic solar cells that contains multiple layers of electrodes and active materials. A fully spray coated photovoltaic (PV) devices fabricated on fabric substrates has been successfully demonstrated with comparable power conversion efficiency to the glass based counterparts. All PV devices are characterised under simulated AM 1.5 conditions. Device morphologies were examined by scanning electron microscopy (SEM). This approach is potentially suitable for the low cost integration of PV devices into clothing and other decorative textilesThis work was supported by Sensor Platform for HEalthcare in a Residential Environment (SPHERE) project (EP/K031910/1). Professor S. P. Beeby acknowledges EPSRC support through his Fellowship ‘Energy Harvesting Materials for Smart Fabrics and Interactive Textiles’ (EP/I005323/1). Professor P. J. Skabara thanks the Royal Society for a Wolfson Research Merit Award

Fully spray-coated organic solar cells on woven polyester cotton fabrics for wearable energy harvesting applications