Journal of the Chilean Chemical Society
versión On-line ISSN 0717-9707
BROVELLI, Francisco; RIVAS, Bernabé L y BERNEDE, Jean Christian. Synthesis of polymeric thin films by electrochemical polymerization of 1-furfuryl pyrrole: Characterization and charge injection mechanism. J. Chil. Chem. Soc. [online]. 2007, vol.52, n.1, pp. 1065-1068. ISSN 0717-9707. doi: 10.4067/S0717-97072007000100002.
The polymeric thin film was synthesized by electrochemical polymerization of 1-furfuryl pyrrole on indium tin oxide (ITO) substrates in aprotic organic media. The cyclic voltammograms and DFT calculations indicate that the electrochemical polymerization process would involve pyrrole rings, although oxidation of the furane ring could also take place. The organic thin films were physicochemically characterized by scanning electron microscopy, electron probe microanalysis, and X-ray photoelectron spectroscopy. The surface morphology has shown that the polymer deposition process has high coverage efficiency. The polymeric layer is very thin with an approximate thickness of 150 nm. When the direct bias is applied to the device, the behaviour is ohmic at low voltage; but once an appropriate value is reached, the current begins to increase exponentially. The current-voltage (I-V) curves exhibit rectifying behaviour with a turn-on voltage at 0.70V. The ideality factor n values found are 9-15, indicating disagreement with the model of a standard Schottky contact.The charge injection mechanism in this device was attributed to the tunnelling effect
Palabras clave : Charge transport; diodes; electrochemistry; ESCA/XPS; thin films.