Poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) is a polymer that has proved its value in the development of electronic devices, attributable to its thermal and mechanical stability and its ability to be processed in aqueous solutions. Despite possessing important qualities, PEDOT:PSS in films does not have sufficient electrical conductivity compared to other polymers. One way to solve it, is with the manufacture of composite films. Accordingly, this work aims to study the optoelectronic characteristics of PEDOT:PSS composite films made by spin-coating. Furthermore, it extends the study to know the effect of metal (copper and palladium) in the porphine and its function inside the PEDOT:PSS films. Fourier Transform Infrared spectroscopy (FTIR) and UV-vis spectroscopy were performed to know the structure and optical properties of the films. Topographic characteristics of films were investigated by atomic force microscopy (AFM) and the films show the results of a consistent incorporation of the metalloporphines with the PEDOT:PSS matrix. In order to change the structure of PEDOT:PSS from benzoid to quinoid form and to improve the electronic behavior, the films were post-treated with isopropanol vapor for 5 minutes at 40 degrees Celsius. Raman spectroscopy show quinoid structure in the PEDOT:PSS. To verify the electrical characteristics in the composite films, the devices: glass/ITO/PEDOT:PSS-porphine/Ag, were manufactured. The films show that each porphine have different conduction mechanisms and are bias-dependent. The conductivity values obtained were between 1.23×102 and 1.92×103 S/cm. The copper porphine presents the largest shunt, series resistance, and have the best improvements. Its bandgap was reduced to 2.80 eV and is the lowest. Therefore, it is suggested to use PEDOT:PSS-copper porphine for high light absorption applications.

Fabrication and characterization of highly functional composite film based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) for applications in optoelectronics

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