Thermal and electrical characterization of indium phthalocyanine chloride bulk structure

Metallic phthalocyanines (M-Pcs) have superior structure, electrical and optical properties. Therefore, M-Pcs can be used as alternatives to traditional semiconductors. In the present work, indium phthalocyanine chloride (ClInPc) is compressed to form a bulk structure (pellet). The prepared ClInPc pellet is characterized by differential scanning Calorimetry (DSC), and impedance spectroscopy in the frequency range of 0.15-100 kHz and at different temperatures (293-393 K). The DSC analysis of the ClInPc shows only one order phase transition at 196 A degrees C. Additionally, the impedance spectroscopy reveals that the capacitance, dissipation factor, dielectric constant, and ac electrical conductivity of the ClInPc are temperature and frequency dependent. The ClInPc also exhibits a high capacitance of order 2-12 nF. Further, the dielectric constant of such material increases by increasing the temperature which involves the distribution of relaxation times. Furthermore, the AC conductivity follows Jonscher's universal power law sigma(ac) = A omega (S) . The temperature dependent exponents S and m also outweigh the correlated barrier hopping (CBH) model for conduction mechanism.