APLICAÇÃO DE MOLÉCULAS AUTO-ORGANIZÁVEIS (SAM) EM FILMES FINOS DE SnO2 / APPLICATION OF SELF ASSEMBLED MOLECULES (SAM) IN THIN FILMS SnO2

AUTOR(ES)

CINTIA DE FÁVERI

DATA DE PUBLICAÇÃO

2008

RESUMO

Thin films of tin dioxide (SnO2) with the addition of doping are widely used because its various applications, so develop a search on this subject is of great value technology, since many different forms of doping, formulation and preparation, can be made and modified, intended to improve this material according to their physical and chemical properties. This paper used for niobium oxide (Nb2O5) as doping, an important factor in the formulation, since Brazil has the largest reserves of natural element, found in various forms of ore. The preparation of thin films is a process that requires great care and high quality control. However, care is not sufficient to avoid the appearance of defects in his deposition, and subsequent calcination, as broken, deterioration, poor adhesion to the substrate, which are considered problems, undermining the efficiency of the material and its applicability. The addition of self assembled monolayers (SAM) on thin films of SnO2 aimed to reduce or correct this type of defect. Different techniques were used experimentally, as: X-ray diffraction, fotochronoamperometric, eletrochemical impedance spectroscopy, electrochemistry, measures of potential open circuit, optical microscopy optical, scanning electron microscopy and Infrared. The results of the measures to density of current and electrochemical impedance of samples of thin films of SnO2 containing SAM showed positive results, confirming that the SAM not only improved the structure of films about the electrochemical properties and photovoltaic, but also corrected the defects caused existing surface the techniques for the generation thin film. The efficiency of photosensitive films studied increased in the following sequence: SnO2 + SAM

ASSUNTO(S)

filmes finos sam quimica sam correção de defeitos correction of defects tin films

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