Now a days the renewable scource of energy is solar. Sun shines on the earth, is providing about 3*10 24 j per year. The systems that storage electrical energy have developed. Solar cells have attractive and several advantage as no production of carbon dioxide. low cost, high efficiency, and low toxic. In this study DSSCs were fabricated CQD-TiO 2 composite photoanodes. We expected the performance of DSSCs was improved by providing the efficient electron transfer paths. DSSCs is made of a photoanode, electrolyte, and counter electrode. The critical component of the dye sensitized solar cell is photoanode that TiO 2 film adheres to FTO glass substrate. I 3 - /I - acetonitrile electrolyte and platinized FTO have been used as electrolyte and counter electrode. EPD technique were used for optimization of the TiO 2 nanoparticle size for devices fabricated to achieve highly efficient plastic dye sensitized solar cells.The purpose of this study is using of water soluble CQDs as the modifier in TiO 2 usage on the surface photo anode. Several methods have been reported for the preparation of C. dots, including laser ablation, electro chemical oxidation, thermal oxidation, microwave irradiation, hot injection, and pyrolysis. we used hydrothermal method and water is used as the reaction medium where the nano sized carbon material are provided. Sugar processing waste that are one of the most natural resources and composed of carbohydrates, calcium carbonate, and phosphate and formation of carbon particles from carbohydrates was confirmed. The main attraction for the use of C.QD are fluorescent nano material, with tunable photoluminescence, rubest chemical interness, low inviromental hazard, and excellent biocompatibility. C.QD is used in bio imaging, drug delievery, ink, sensors, opto electrics and photocatalysis. The synthesized C.QD was characterized by X-ray diffraction, fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), EDX , fluorescence and absorption spectroscopy.