Fotorresposta de uma célula eletroquímica nanocristalina sensibilizada por corante a base de essência de beterraba.

Abstract

The research project aimed to present an alternative way to the process of electricity generation using as an energy source solar energy. The factors that contribute negatively to traditional photovoltaic cells are its cost and difficulties in the production process, being very complex and with limited mechanical flexibility. Current cells use as fundamental material highly pure silicon crystals. To decrease the cost and difficulty of producing such photovoltaic cells models, studies are being conducted to manufacture photovoltaic cells type dye-sensitized in order to cheapen their production and spread mainly use the lower classes. One of the factors contributing negatively to their use is their low efficiency compared to traditional cells, but offset by low investment cost its use becomes very attractive. This research project analyzed the development of reproducible manufacturing processes of low cost and use of new materials in a thin layer structures. Our goal was to prepare cells with natural dyes (beet extract) using TiO2 as the main chemical elements. The purpose of this study is the use of a liquid electrolyte, ie, iodide / triiodide (I− / I−3 ) associated with a dye mentioned above. The cells showed a similar behavior to a heterogeneous dielectric system gives rise to the presence of several phases coexist. Rich phases Betalains percolated exhibiting significant photovoltaic response. Intermediate phases with scattered betalaína beet extract matrix with photosensitivity and poor phases betalaína not present any fotoresposta. The results of electrical current generation showed a current of about 42 µA for a cell with an area 2 × 2 cm2.