Dielectric and electrical properties of a benzotriazole and fluorene copolymer were investigated using current-voltage (IV), capacitance-voltage (CV), and conductancevoltage (G/wV) measurements at room temperature. The electrical parameters, barrier height (φBo), and ideality factor (n) obtained from the forward bias LnI-V plot were found as 0.453 eV and 2.08, respectively. The Rs values were found as 2.20, 2.12, 1.90 Ω using dV/dLnI versus I, H(I) versus I and F(V)-V plots, respectively. The dielectric constant (ε'), the dielectric loss (ε''), and the ac electrical conductivity ( σac) are a strong function of voltage and frequency. Decrease in ε' and ε'' values with increasing frequency was observed. On the other hand, the increase of σac with increasing frequency was observed. Experimental results show that the conjugated copolymer plays an important role in the values of barrier height, ideality factor, series resistance, and dielectric parameters.
Yildiz, Dilber Esra, Dogukan Hazar Apaydn, Levent Toppare, Ali Cirpan
J. Appl. Polym. Sci.