Dielectric and electrical properties of an organic device containing benzotriazole and fluorene bearing copolymer

Dielectric and electrical properties of a benzotriazole and fluorene copolymer were investigated using current‐voltage ( I – V ), capacitance‐voltage ( C – V ), and conductance–voltage ( G/w–V ) measurements at room temperature. The electrical parameters, barrier height (φ Bo ), and ideality factor ( n ) obtained from the forward bias LnI ‐ V plot were found as 0.453 eV and 2.08, respectively. The R s  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 ( σ ac ) 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 σ 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. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013