8 documents found, page 1 of 1
Effect of the Performance of Lignin Into the Matrix of the TiO2 with Applicatio...
Teixeira,Edwalder Silva; Nunes,Vanja Fontenele; Pinho,Diego Caitano; Maia Júnior,Paulo Herbet França; Lima,Francisco MarconeAbstract Founding new materials and structures for solar cells is a challenge in the photovoltaic field. This work evaluated the effect of the lignin in the photovoltaic activity by compounding with TiO2/lignin as photoanode for the dye sensitized solar cells (DSSC’s). Hybrid films (TiO2/lignin) with different concentrations of lignin (5, 10 and 15%) were deposited by spin coating over commercial TiO2 thin film...
Effects of tin on the performance of ZnO photoanode for DSSC
Nunes,Vanja Fontenele; Lima,Francisco Marcone; Teixeira,Edwalder Silva; Maia Júnior,Paulo Herbert França; Almeida,Ana Fabíola LeiteABSTRACT Tin Zinc Oxide thin films were deposited on transparent conductive oxide by chemical bath, at percentages of 5, 10 and 15% of tin (Sn) on the zinc oxide (ZnO) structure. All films were thermally treated to improve its crystallinity. The produced films with tin were characterized by x-ray diffraction and optical measurements, such as absorbance, transmittance and reflectance. The x-ray spectrum showed t...
Building and Testing a Spin Coater for the Deposition of Thin Films on DSSCs
Teixeira,Edwalder Silva; Cavalcanti,Raphael Coelho; Nunes,Vanja Fontenele; Maia Júnior,Paulo Herbet França; Lima,Francisco Marcone; Pinho,Diego CaitanoAbstract A low cost spin coater was constructed in this work for the deposition of thin films of titanium dioxide (TiO2) on conductive substrate of FTO (fluoride doped tin oxide) with application on dye sensitized solar cells. The results showed a 95% precision between the speed values obtained by the software of C#sharp language and the spin values observed directly on the device. The TiO2 films deposited thro...
Nanostructured titanium dioxide average size from alternative analysis of Scher...
Lima,Francisco Marcone; Martins,Felipe Mota; Maia Júnior,Paulo Herbert França; Almeida,Ana Fabíola Leite; Freire,Francisco Nivaldo AguiarABSTRACT The materials sizing in nano-scale is a challenge to be overcome, because the size determined by various methods differ. In order to shed light about the nanomaterials sizing, a modified Scherrer's equation was applied to estimate more accurately the nanostructured titanium dioxide crystal size. The manufactured titanium dioxide-nanostructured powder with nominal average size about 21nm was used as the...
Performance Evaluation of Titanate Nanotubes and Nanoribbons Deposited by Elect...
Souza,Antonio Paulo Santos; Ferreira,Odair Pastor; Nunes,Vanja Fontenele; Almeida,Ana Fabíola; Lima,Francisco Marcone; Freire,Francisco Nivaldo AguiarNanoparticles of TiO2 have been the main semiconductor applied in Dye-sensitized solar cells (DSSCs). In this work, titanate nanotubes (NaTiNT) and nanoribbons, were obtained by the hydrothermal method from TiO2 anatase. These materials were deposited on conductive substrate by electrophoresis, with and without thermal treatment, sensitized by ruthenium-based dye and used as work electrode. Exposing those photo...
Use of SnOx:F in the Recycling of Silicon Solar Cells
Lima,Francisco Marcone; Alves,Jean Faber Araújo; Maia Júnior,Paulo Herbert França; Martins,Felipe Mota; Teixeira,Edwalder SilvaAmongst the many parts of a silicon cells photovoltaic module, silicon is the most important and expensive constituent. Thus, research on silicon recycling from damaged cells can lead to economic and environmental benefits. In this work, the broken silicon cells were tailored to function along with the fluorine-doped tin oxide as the transparent electric conductors. The broken silicon cells were analyzed by the...
Modelo teórico relacionando as potências elétrica e química em célula fotossens...
Lima,Francisco Marcone; Bezerra,Karine Pereira; Marques,Maria Katiane Diógenes; Maia Júnior,Paulo Herbert França; Freire,Francisco Nivaldo AguiarEste trabalho apresenta um modelo teórico que relaciona a potência elétrica com a potência química numa célula fotossensibilizada com corante. O mesmo é baseado na junção dos conceitos presentes nos modelos de potencial químico e de potência química. Assim, a partir destas duas considerações é possível a realização de testes sob diversas condições físicas e ambientais, durante o processo de conversão de energia...
Caracterização da eletrodeposição de filmes finos de CdTe sobre Pt em meio ácido
Sousa,José Hugo de Aguiar; Maia Junior,Paulo Herbert França; Silva,Álvaro Neuton de Araújo; Lima,Francisco MarconeRESUMO A eletrodeposição tem sido empregada para a obtenção de materiais semicondutores; todavia, ainda não estão bem esclarecidos os mecanismos envolvidos neste processo. Neste sentido, este trabalho apresenta a investigação deste processo, evidenciando a caracterização do CdTe eletrodepositado sobre substrato platina em solução ácida. A deposição ocorre a partir de 0,0 V, em relação ao eletrodo Ag/AgCl,KClsat...