LAUSR

Structural evolution and electrical and dielectrical properties of hybrid structures based on PCDTBT: graphene nanocomposite were reported. The insertion of the graphene layers into the PCDTBT matrix is proved by the analysis of the Raman and the XRD curves obtaining for the PCDTBT: graphene hybrid nanocomposite. In fact, the Raman spectrum of PCDTBT: graphene nanocomposites shows the appearance of a new peak in 1620 nm position corresponds to the G-band of graphene. The effect of adding different weight ratios of graphene layers added (1.5, 2, and 2.5 wt%) into PCDTBT matrix on electrical properties was discussed in dark condition. The electrical parameters such as the ideality factors (n), the barrier height (ɸb), and the series resistance (Rs) were calculated. The charge transport was evaluated by space-charge-limited conduction mechanism. The dielectrical behavior shows a strong effect of graphene addition. It increases the trap state density (Nss). Moreover, a relaxation peak appeared in the imaginary parts of impedance (Z″) in the range of (ms) indicating a dipolar relaxation type.