Photovoltaic Devices
Mostrando 13-24 de 27 artigos, teses e dissertações.
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13. Construção de células solares sensibilizadas por corante a partir de nanoestruturas de ZnO obtidas por método hidrotermal / Construction of dye-sensitized solar cells from Nanostructures ZnO obtained by Method Hidroterma
The Photovoltaic (PV) sector has been facing an accelerated development rate within the last decade, which is comparable to the other renewable energy sources, according to the data released by the International Energy Agency (IEA). Therefore, a myriad of R&D activities and technological innovations are under way in order to cut down the manufacturing cost o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/08/2011
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14. Estudo e caracterização de dispositivos fotovoltaicos orgânicos (OPV) baseados em heterojunção de volume / Study and characterization of organic photovoltaic devices (OPV) based on bulk heterojunction
Um dos grandes desafios do século XXI está na produção de energia limpa e renovável, já que a demanda mundial por energia continuará crescendo, assim como a necessidade de despoluir o planeta e de diminuir a emissão dos gases do efeito estufa. Nesse contexto, a conversão de energia solar em elétrica coloca-se como uma excelente alternativa, e com i
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2011
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15. Desempenho de um painel fotovoltaico de baixa tensão, acoplado ao protótipo de um conversor dc/dc topologia Booster
Low voltage solar panels increase the reliability of solar panels due to reduction of in series associations the configurations of photovoltaic cells. The low voltage generation requires DCDC converters devices with high efficiency, enabling raise and regulate the output voltage. This study analyzes the performance of a photovoltaic panel of Solarex, MSX mod
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/06/2010
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16. Estudo de materiais, estruturas de dispositivos e fenômenos de transporte em sistemas fotovoltaicos híbridos orgânico-inorgânico / Study of materials, device structures and transport phenomena in hybrid photovoltaic systems
Recently a fast development in organic and hybrid photovoltaic field has been observed. Such devices are fabricated by organic semiconductors within components of a heterojunction, in which bulk heterojunctions obtained via interpenetrating networks at the sub-20-nm length scale. It permits the effective collection of photogenerated charge carriers even with
Publicado em: 2010
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17. O estado da arte da síntese de semicondutores nanocristalinos coloidais
Colloidal semiconductor nanocrystals, also known as quantum dots, have attracted great attention since they have interesting size-dependent properties due to the quantum confinement effect. These nanoparticles are highly luminescent and have potential applications in different technological areas, including biological labeling, light-emitting diodes and phot
Química Nova. Publicado em: 2010
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18. Study for development of organic photovoltaic devices / Estudo para o desenvolvimento de dispositivos fotovoltaicos orgânicos
Este trabalho é dedicado à preparação e a caracterização de dispositivos fotovoltaicos baseados em matrizes poliméricas modificadas com óleo de buriti (OB). O presente desenvolvimento consiste na deposição de camada do polímero condutor PEDOT/PSS, sobre substrato de vidro com óxido de zinco dopado com flúor (FTO), onde depois foi depositada a ca
Publicado em: 2010
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19. Análise fotocondutiva de estruturas fotovoltaicas baseadas em TiO2 e poli(3-hexiltiofeno) / Photoconductivity analysis of photovoltaic structures based on TiO2 and poly(3-hexylthiophene)
In this work we investigated electronic transport phenomena in an ITO/TiO2/RRP3HT/Al structure using photoconductivity spectral response when devices were illuminated either by the ITO electrode or by the aluminum. RRP3HT is the regioregular poly(3-hexylthiophene), a polymer that exhibits a relatively strong photovoltaic activity. RRP3HT were dissolved in a
Publicado em: 2009
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20. Analise comparativa de sistemas de armazenamento de energia eletrica fotovoltaica por meio de baterias e hidrogenio em localidades isoladas da região Amazonica / Comparative analysis of photovoltaic power storage systems by means of batteries and hydrogen in remote areas of the Amazon region of Brazil
In this work, comparative analyses of photovoltaic power storage were made, first by the traditional means employing lead-acid batteries, and second by means of electrolytic hydrogen which was later reconverted to power in a fuel cell. In order to design the two systems, it was used a load profile of the communities in Amazon region and by means of a mathema
Publicado em: 2008
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21. Desenvolvimento de um protÃtipo de rastreador solar de baixo custo e sem baterias
In the last fifty years, the use of solar energy in the world has been growing considerably in its principal modalities: thermal and photovoltaic. Although there has been significant evolution of the photovoltaic technology along the last decades, the cost of the energy produced by those systems is still expensive when compared to the energy produced by conv
Publicado em: 2007
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22. Photovoltaic devices based on photo induced charge transfer in polythiophene: CN-PPV blends
We have investigated the photovoltaic properties of polymer devices based on a blend of two polymers, (poly(3-(2'-methoxy-5'-octylphenyl) thiophene) (POMeOPT) and poly(2,5,2',5'-tetrahexyloxy-7,8'-dicyanodi- p-phenylenevinylene) (CN-PPV), where photo induced charge transfer takes place at the interfaces formed by the interpenetrating network of the donor and
Brazilian Journal of Physics. Publicado em: 2003-06
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23. Zirconium phosphonate/1,4,5,8-naphthalenediimides self-assembled films
The formation and characterization of self-assembled films of zirconium phosphonate / N,N'-di(2-phosphonoethyl)-1,4,5,8-naphthalenediimide (DPN) is presented. The films were produced on glass substrates by deposition of alternating layers of Zr+4 and DPN. Films containing up to 16 layers on each side of the substrate were obtained and monitored by absorption
Anais da Academia Brasileira de Ciências. Publicado em: 2000-03
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24. Efeito fotovoltaico e fotocondutividade em dispositivos poliméricos / Photovoltaic effect and photoconductivity in polymer devices
Os polímeros conjugados têm sido objeto de estudo nos últimos vinte anos devido à grande variação observada em sua condutividade quando sob dopagem química. A maioria dos polímeros dessa família passa de isolante, quando não dopados ou fracamente dopados, a bons condutores de eletricidade quando fortemente dopados. Em dopagens intermediárias apres
Publicado em: 2000