Estudo da deposição de estanho em vidro para aplicação como eletrodo em célula solar fotovoltáica de terceira geração.

Abstract

There are currently three generations of solar cells, the most recent being the Dye-Sensitized Solar Cells-DSSC, also referred to as Grätzel cells. One of the essential parts of this type of solar cell is transparent electrodes formed from metal oxide, the most common being tin(SnO2). T-his oxide has been widely used as a conductive glass film, since it combines characteristics such as electrical conductivity with transparency in the visible region of the electromagnetic spectrum, and can be applied to a large number of electronic devices. However, because tin dioxide is a high value-added material, alternatives for its production are being studied, one of these studies is the use of tin chloride to form the conductive glass film. Thus, this work has as objective to obtain a solution promoter of tin from commercial welding alloy. Two techniques were evaluated: acid and hydrometallurgical treatment. Samples of solder alloy (Sn/Pb) were subjected to an acid and thermal treatment, with the lead separation of the tin and formation of the tin chloride solution. Doping tests were carried out using the tin chloride solution together with ammonium fluoride used in the formation of films on glass plate surfaces. The verification parameter of the conductive film formation was the electrical resistance, obtained from the electrical conductivity. The solution of tin chloride generated by the hydrometallurgical process of the weld alloy allowed the deposition of a conductive layer in glass, and resistance obtained with conductive film with this methodology was of 0.4 to 3 KΩ. Although the resistance is above commercial values, obtaining the tin chloride solution from the commercial solder or electronic waste minimizes significantly the cost of production of the conductive thin films, making the process even more recyclable, if the alloy is used Soldering of electronic waste.