An efficient method to exfoliate graphite to prepare exfoliated few-layer graphene (EXG) was carried out in this thesis. Through proper centrifugation at different rounds per minute (rpm), three kinds of exfoliated graphene flakes (EXG 800, EXG 1500 and EXG 3000) with different qualities were obtained. The qualities of these EXG flakes were characterized by TEM, TGA and Raman spectroscopy. Raman spectra also states that the EXG 3000 flakes were of good quality and can be highly functionalized. Further research was focussed on the functionalization of EXG 3000 with charge donating Ï€-centre based on diketopyrollopyrrole (DPP). The resulting hybrids graphene material has good solubility in organic solvent and wide light absorption (500 nm – 800 nm) features. Electron or energy transfer from DPP chromophores to EXG flakes was confirmed by the efficient fluorescence quenching of DPP chromophores. The new hybrid materials are under investigation as a third component in P3HT: PCBM bulk-heterojunction blends for organic photovoltaic applications.