▎ 摘　　要

The dependence of device performance has been measured for solar cells using blends containing the conjugated polymer, poly (3-hexylthiophene) (P3HT) with two different functionalized electron acceptor commercially available [6,6]-phenyl C-60 butyric acid methyl ester (PC60BM) and graphene derivative to increase the carrier mobility which was produced in this laboratory. Performance was characterized by short-circuit current-open circuit voltage output of the devices. The interrelationships between UV-Vis absorption, fill factor and energy conversion efficiency (ECE) have been simulated. It is observed that the ECE of the device with low concentration of solution-processable functionalized graphene (SPFGraphene) has been increased significantly compared with the device without SPFGraphene. The improved performance is attributed to the presence of semiconducting graphene which provides charge-transport pathways for carriers to be extracted and hence boosts carrier mobility in organic photovoltaic (OPVs) devices. However, when the concentration of SPFGraphenes increased up to certain degree, the performance of the device decreased. By analysis on the intensity dependent photocurrent, the decreased performance is attributed to the PC60BM-graphene which causes bimolecular recombination of free carriers. In addition, the active layer films were also investigated by XRD and SEM in order to understand the crystallite and morphology of the hybrid films.