Corantes a partir da meso-porfirina do LCC para aplicação em células solares sensibilizadas.

• Ano de defesa: 2018
• Autor(a) principal: Sampaio, Samuel Gondim
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Energia solar; Célula solar sensibilizada; Corantes; Meso-porfirina; Meso-porfirina metalada
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/38186

Interest in the development of new ways of capturing solar energy through sensitized solar cells has a strong growth perspective, mainly because conventional energy sources are scarce and polluting. The objective of this study was the synthesis, characterization and application of new dyes for sensitized solar cells, prepared from cardanol - major component of Cashew Nuts (CNSL). For this synthesis, a chemical route was used whose intermediates were: brominated (1- (2-bromoethoxy) -3-pentadecylbenzene) followed by the (4- [2- (3-pentadecylphenoxy) ethoxy] benzaldehyde aldehyd) and the porphyrinic (meso-tetra- [4- (2- (3-pentadecyl) phenoxy) ethoxy] phenylporphyrin) (3-n-PDPP) to obtain the free base macromolecule. The metal derivatives (Copper, Cobalt, Zinc and Nickel) were obtained by reacting these with the free base macromolecule. Dyes and precursors were characterized by UV / Vis Spectroscopy, Scanning Electron Microscopy (SEM), Optical Microscopy, Dielectric Measurements and Electrical Measurements. For the tests in solar cells, a standard prototype was fabricated with sandwich architecture, consisting of layers containing SnO2: F conductive glasses with high transmittance (~ 80 %) and low resistance (8-12 Ω / cm2). The top of the prototype was formed by a photoanode with an active layer of TiO2, deposited by screen print, and the sensitizing dye, applied by dip-coating. The electrical efficiencies of the prototypes with the meso-porphyrin and the metallic complexes of Ni, Cu, Co and Zn were: 8,0 x 10-5 %, 1,2 x 10-1 %, 3,0 x 10-5 %, 1,0 x 10-5 % e 2,8 x 10-4 %, respectively, showing for all the cases studied, functional photoelectric activity. All prototypes were subjected to the same light output as 1000 Wm-2, which is the standard condition for use as solar cells.