Electrical Characteristics of Al/CNT/NiPc/PEPC/Ag Surface-Type Cell

The blend of nickel phthalocyanine (NiPc) (2 wt.%) poly-N-epoxypropylcarbazole (PEPC), (1 wt.%) and carbon nano-tube (CNT) powder (2 wt.%) in benzole is deposited by drop-casting on glass substrates with pre-deposited metallic electrodes to fabricate Ag/CNT/NiPc/PEPC/Al surface type cell. It is assumed that the high nonlinearity of the I−V characteristics is related to deep traps in the nano-scale depletion region in NiPc that is observed experimentally. The values of ideality factor and barrier height are determined from the I−V curve and they are found to be 8.4 and 1.05 eV, respectively. The values of mobility and conductivity are calculated to be 7.94×10⁻⁸ cm²/Vs and 3.5×10⁻⁶ Ω^-1cm⁻¹. The values of ideality factor and series resistance are also calculated by using Cheung's functions, which are in good agreement with the values calculated from the I−V curve.