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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Desenvolvimento de Célula Solar baseada em pigmento fotossensibilizador

Silva, Andrey Marcos Pinho da, 92-99256-5754 18 March 2016 (has links)
Submitted by Ilvana Bentes (vovoquinha.ufam@gmail.com) on 2018-09-17T15:08:05Z No. of bitstreams: 1 Final + ficha cartolografica.pdf: 3843020 bytes, checksum: ce562c916a2f1bb8366b5d9c69ea7900 (MD5) / Approved for entry into archive by Marcos Roberto Gomes (mrobertosg@gmail.com) on 2018-09-17T15:18:30Z (GMT) No. of bitstreams: 1 Final + ficha cartolografica.pdf: 3843020 bytes, checksum: ce562c916a2f1bb8366b5d9c69ea7900 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2018-09-17T17:45:03Z (GMT) No. of bitstreams: 1 Final + ficha cartolografica.pdf: 3843020 bytes, checksum: ce562c916a2f1bb8366b5d9c69ea7900 (MD5) / Made available in DSpace on 2018-09-17T17:45:03Z (GMT). No. of bitstreams: 1 Final + ficha cartolografica.pdf: 3843020 bytes, checksum: ce562c916a2f1bb8366b5d9c69ea7900 (MD5) Previous issue date: 2016-03-18 / FAPEAM - Fundação de Amparo à Pesquisa do Estado do Amazonas / 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. / Estudos referentes a questões energéticas estão em amplo desenvolvimento no meio científico, é o estudo da conversão de energia solar em energia elétrica, com a utilização de células solares exerce um principal papel no que se fala de energias renováveis. Baseado nisso algumas modificações vem ocorrendo no desenvolvimento de células modernas, um dos dispositivos que se destacam nesse desenvolvimento, são as células solares baseadas no uso de corantes fotoexcitáveis ou sensibilizadores. Neste trabalho utilizou-se os pigmentos FB01 e FB02, como sensibilizadores de celulas solar fotoeletroquímica. As nanopartículas de TiO2 foram sintetizadas pelo método sol-gel, e seu tamanho de partícula foi determinado por DRX (20 nm) e análise topográfica via MEV. As propriedades óticas e estruturais (TiO2, FB01 e FB02) foram investigados por espectroscopia UV-Vis e de Infravermelho. Com relação ao eletrólito, estudou-se a modificação deste por um eletrólito polimérico analisando diferentes concentrações de plastificantes (25%, 50% e 70 %). Os parâmetros elétricos são: para FB01, temos: Isc: 2,184X10-7, Voc: 0,17414, n: 5,521X10-5, Pmáx: 4,831x10-9, Vmp: 0,068148, ff: 12. E para o FB02, temos: Isc:1,877X10-5, Voc: 0,03209, n: 0,0017, Pmáx: 1,486x10-7, Vmp: 0,016112, ff: 24.

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