<p align="justify">Com a previsível escassez dos recursos energéticos, as preocupações com as questões ambientais se tornam cada vez mais evidentes. Com isso, houve um incremento na busca de recursos alternativos para a produção de energia elétrica, principalmente aqueles baseados em fontes limpas e renováveis, como a energia solar. Para a conversão de energia solar em energia elétrica são utilizadas, na maioria das vezes, células solares fotovoltaicas, que se baseiam na propriedade semicondutora de silício. Como o custo dessa tecnologia ainda é muito alto, são propostos novos materiais para a substituição desse cristal, com destaque para a célula solar nanocristalina de dióxido de titânio (TiO2), acrescida de moléculas orgânicas de corantes. Essa célula apresenta vantagens em relação às células convencionais de silício, pois, na sua fabricação, são utilizados materiais disponíveis no mercado e corantes extraídos de plantas, modelo proposto por Gratzël, além de ser preparada através de processos simples e não poluentes. O objetivo deste trabalho é recriar as células solares nanocristalinas de dióxido de titânio, otimizando-a para a utilização de materiais com baixo custo, de modo que se obtenha a maior eficiência energética possível.</p><p align="justify">Abstract</p><p align="justify">With the expected shortage of energy resources, the concerns about environmental issues are becoming increasingly evident. Thus, there was an increase in search for alternative resources for energy production power, especially those based on clean sources and renewable energies such as solar energy. Converting solar energy into electrical energy, in most cases, solar cells photovoltaics, which based on property semiconductor silicon are used. As the cost of this technology is still very high, new materials are proposed for substitution this crystal, with emphasis on the cell nanocrystalline titanium dioxide (TiO2) solar plus molecules organic dyes. This cell has advantages compared to conventional silicon cells, because in his manufacturing, available materials are used in the market and extracted dyes from plants, the model proposed its by Grätzel, besides being prepared through Simple and clean process. The goal of this essay is to recreate the nanocrystalline solar cells titanium dioxide, optimizing it to the use of materials with low cost, so as to obtain the energy efficient as possible.</p>
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