Measurements of Large Dielectric Constants in Phthalocyanine Tetramers

Understanding the dielectric constant of organic materials is important for applications including organic transistors and photovoltaics. We have measured the dielectric constant and dissipation factor of oligomer metal-phthalocyanine (MePcs) pellets. Zn and Cu based tetramers (MeC$_{30}$H$_{10}$N$_{8}$O$_{8})_{4}$ are water soluble materials with high dielectric constant. We investigated these materials in the frequency range 20--10$^{6}$ Hz and at temperatures up to 110\r{ } C. Both the dielectric constant and dissipation factor were found to increase strongly with temperature and to decrease with frequency.