Desenvolvimento de Célula Solar baseada em pigmento fotossensibilizador

Abstract

Studies involving renewable energies have a leading role in the global scientific context. Due to the need of improve the use of renewable energy resources have been developed new generations of solar cells that enable made devices more efficient, with low-cost and versatile applications. The solar cells based on the use of photosensitizing dyes have a significant potential for applications in low cost photovoltaic devices. In this work were employed vegetal pigments as photosensitizing agents of the nanostructured semiconductor layer of the TiO2 in solar cells of the modified Grätzel type. The TiO2 nanoparticles were synthesized by sol-gel method, and its average particle size was determined by techniques of XRD and SEM. The structural and optical properties of the pigments and the semiconductor layer were studied using UV-Vis spectroscopy and FTIR. Were performed studies in order to optimize the performance of the devices through the modification of the composition of the non-aqueous liquid electrolyte that has been replaced by a solid polymeric electrolyte. The electrochemical characterization was made using the voltammetry techniques and electrochemical impedance spectroscopy that allowed deepen in to the efficiency parameters and the charge mobility through the different layers that constitute the photovoltaic device. The electrical characterization of FB0 Isc: 2,184X10-7, Voc: 0,17414, n: 5,521X10-5, Pmáx: 4,831x10-9, Vmp: 0,068148, ff: 12. And FB02 Isc:1,877X10-5, Voc: 0,03209, n: 0,0017, Pmáx: 1,486x10-7, Vmp: 0,016112, ff: 24.