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Nanoestruturas revestidas com corante para células solares de elevada eficiência
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ISBN10: 6208385652
ISBN13: 9786208385651
Publisher: Edicoes Nosso Conhecimento
Published: Dec 16 2024
Pages: 92
Weight: 0.32
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208385651
Publisher: Edicoes Nosso Conhecimento
Published: Dec 16 2024
Pages: 92
Weight: 0.32
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Portuguese
As células solares sensibilizadas por corantes (DSSC) baseadas em TiO2 nanocristalino apresentam uma elevada eficiência de conversão de energia, sendo um dos substitutos mais comuns para dispositivos de conversão de energia solar de baixo custo a alta temperatura. O ZnO é outro semicondutor metal-óxido promissor que pode substituir o TiO2 devido à sua maior mobilidade eletrónica em comparação com o TiO2 e ao seu nÃvel de energia da banda de condução ser semelhante ao do TiO2. As partÃculas nanocristalinas de ZnO foram preparadas pelo método sol-gel utilizando eléctrodos mesoporosos para células solares sensibilizadas por corantes. A fase anatase do ZnO foi confirmada por XRD. A microscopia eletrónica de transmissão (TEM) foi utilizada para confirmar o tamanho das partÃculas das nano partÃculas de ZnO. O revestimento das nanopartÃculas de ZnO com corantes naturais extraÃdos dos espinafres e ouro casado foi efectuado. O microscópio eletrónico de varrimento e o estudo EDX revelam a morfologia e a composição elementar das nanopartÃculas de ZnO puras e revestidas com corantes naturais. O gráfico de Tauc confirmou a diminuição do intervalo de banda das nanopartÃculas de ZnO com revestimento de corante natural. Os espectros de dispersão Raman revelam modos de fonões activos para todas as amostras sintetizadas. As nanopartÃculas revestidas com corante natural são consideradas melhores.
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