▎ 摘　　要

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 (b), and the series resistance (R-s) 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 (N-ss). Moreover, a relaxation peak appeared in the imaginary parts of impedance (Z '') in the range of (m(s)) indicating a dipolar relaxation type.