High Performance of Solar cell based on Brazilian natural dyes and nano semiconductors: TiO2nd SnO2-F using solar simulator

Reference	Presenter	Authors (Institution)	Abstract
13-057	Icoana Lais Leitão Mascarenhas Martins	Martins, I.L.(Universidade de Brasília); Hidalgo, M.d.(University of Brasilia); Brito, R.(Universidade de Brasília); Menezes, V.L.(Universidade de Brasília); Souza, D.C.(University of Brasilia); Silveira, L.(Universidade de Brasilia); Santos, E.(Escola Politécnica da Universidade de São Paulo); Wang, S.H.(Escola Politécnica da Universidade de São Paulo);	This work show a high performance of type dye-sensitized solar cell (DSSCs). The fabrication process has been optimized in focus in the extract of Brazilian Natural Dyes, and the synthesis and deposition of TiO2 and ZnO-F5% Nano semiconductor on glass substrate. Brazilian Naturals dyes: cauliflower (oleracea extract), Blackberry (Rubus) and Urucum (Bixa orellana ) were extract of leaf using Dimethyl Sulfoxide (DMSO) as solvent with lower evaporation loss. Semiconductor nanoparticles (NPs) SnO2-F 5% and TiO2 were synthesized by Pechini Method. For assamble DSSCc was used as cathode and anode thin film SnO2-F5% on glass (2.2 cm2) as substrate deposited by spray pyrolysis spray technique, with results similar as obtained by commercial ITO- glass slides. So for the anode formation was deposited above the substrate a thin layer of NP semiconductor TiO2 with anastase structure and Egap (2.9 eV), besides a graphene layer with high conductivity produced in laboratory in order to obtain more efficiency, and finally was deposited the natural dyes. Electrolyte solution I-/IO3- was addition between the electrodes. The DSSCs results obtained using solar simulator were: glass+TiO2+Graphene+Chlorophyll 0.30V (Voc) and 0.75% n (efficiency) , glass+TiO2+Graphene+blackberry 0.35V and 0.58% n, and glass+TiO2+Graphene+urucum 0,14 V and 0.25%n. These results were higher that showed in literature. References: [1] Hidalgo, P.; at. el. Optimization the Efficiency Photovoltaic Solar Cells Using Synthesized TiO2 Semiconductor Nanomaterials and Functionalized Carbon Nanotubes. Energy Procedia, v. 57, p. 1860-1867, 2014. [2] Smith, G., Granqvist, C.G., Green Nanotechnology. CRC Press, USA, 2010, p.147. [3] Richhariya G., Kumar A., Tekasakul P., Gupta B. Natural dyes for dye sensitized solar cell: A review. Renewable and Sustainable Energy Reviews. Vol 69,March 2017,Pg 705-718
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