Investigation of solution processed poly (4,4-dioctylcyclopentadithiophene) thin films as transparent conductors

Thin films of poly(4,4-dioctyleyclopentadithiophene) were obtained by processing from solution. These films were doped by treatment with iodine or DDQ and their conductivity determined by electrical measurements. The iodine doped polymer films show conductivities of up to 0.35 S/cm but the conductivities decreased on standing due to reversible dedoping of the films. Polymers doped with DDQ are more stable and conductivities up to 1.1 S/cm are reported. The doped polymers show little absorption in the visible region of the spectrum, suggesting possible applications in plastic electronics. (C) 2004 Elsevier B.V. All rights reserved.