Análise fotocondutiva de estruturas fotovoltaicas baseadas em TiO2 e poli(3-hexiltiofeno) / Photoconductivity analysis of photovoltaic structures based on TiO2 and poly(3-hexylthiophene)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

In this work we investigated electronic transport phenomena in an ITO/TiO2/RRP3HT/Al structure using photoconductivity spectral response when devices were illuminated either by the ITO electrode or by the aluminum. RRP3HT is the regioregular poly(3-hexylthiophene), a polymer that exhibits a relatively strong photovoltaic activity. RRP3HT were dissolved in a solution of chloroform and nanoparticles of TiO2 were used in a colloidal dispersion. Both thin films of TiO2 and P3HT were deposited by spin coating technique over a commercial glass covered with ITO, and Al electrode was vacuum evaporated. Photoconductivity measurements were carried out making use of a Xenon lamp of 450 W and a monochromator to produce a single spectral line. After several measurements, having temperature and constant applied voltage as parameters, we obtained a great amount of important electrical data for the devices. Depending on the experimental conditions we obtained different photocurrent response, i. e. symbatic or antibatic. A model based on recombination mechanisms and photogenerated charges, including the absorption profile of the RRP3HT, allowed us to get some electrical parameters that are important for photovoltaic and photoconductive applications.

ASSUNTO(S)

polímeros condutores fotocondução organic devices photoconduction conductive polymers dispositivos orgânicos

ACESSO AO ARTIGO

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