The electrical conductivity of doped oligo[aromatic diimidoselenide]

DC electrical conductivity of oligo[aromatic diimidoselenide] is studied in the temperature range 300–500 K after doping. The dopants used are I2, FeCl3, ZnCl2, NaClO4 and CuSO4. Doping is done by mixing with 10% of the dopant, and by chemical doping. The DC electrical conductivity of the two types of doped materials is measured, compared and results interpreted. A trend of high DC electrical conductivity in the case of chemical doping especially with I2 has been noticed. A conduction of 10−7 S cm−1 is obtained at ambient or higher temperatures. This is related to a charge transfer complex formation between the oligomers and I2. The complexation is confirmed from the electronic spectra of the chemically doped materials which showed a decrease in the π–π* energy absorption bands and an increase in the n–π* energy absorption bands.