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 (phi Bo), and ideality factor (n) obtained from the forward bias LnI-V plot were found as 0.453 eV and 2.08, respectively. The Rsvalues were found as 2.20, 2.12, 1.90 using dV/dLnIversus I, H(I)versus I and F(V)-V plots,respectively. The dielectric constant (epsilon), the dielectric loss (epsilon), and the ac electrical conductivity (sigma ac) are a strong function of voltage and frequency. Decrease in epsilon and epsilon values with increasing frequencywas observed. On the other hand, the increase of sigma ac 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. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013