The Fourier-transform infrared (FT-IR) spectra of magnesium phthalocyanine
(MgPc) were investigated in the spectral range 500–4000 cm-1.
The spectra allow characterization of vibration modes. A comparison
of absorption spectra of powder, as-deposited and annealed films is
presented. The dark electrical resistivity measurements were carried out at different
temperatures in the range 308 to 423 K. Two activation energies ΔE1 = 0.23 eV and ΔE2 = 0.69 eV were obtained.
The thermal activation energy ΔE1 is associated with
impurity conduction and ΔE2 is associated with intrinsic
conduction. The current density-voltage characteristics of MgPc at room
temperature showed a linear ohmic conduction mechanism at low voltages. At
higher voltages the space-charge-limited conduction (SCLC) accompanied as a
single dominant level. The temperature dependence of current density allows
the determination of some essential parameters such as the hole mobility
(μh), the trapping factor Θ and the total trap
concentration (Nt).