Maryam Shirkavand - Physics Dept, Khayyam University, Mashhad, Iran
Mohammad Bavir - Electrical and Computer Engineering Dept, Shahab Danesh University, Qom, Iran
Ali Fattah - Faculty of Electrical Engineering and Robotic, Shahrood University of Technology, Shahrood, Iran
Hamid Reza Alaei - Faculty of Physics, IAU Varamin-pishva Branch, Tehran, Iran
Mohammad Hossein Tayarani Najaran - Faculty of Physics, Ferdowsi University of Mashhad, Mashhad, Iran

In a dye-sensitized solar cell (DSSC), the amount of light absorption dependson the design of the pigments, which determines the strength of light absorption and theoptical range of the cell. In this paper, we have constructed and studied two fairly similarpattern of DSSCs in structure. The thickness of TiO۲ used for both cells is taken to be ۲μm. We have used an industrial N۷۱۹ dye for one of the cells and a natural blackberrydye for the other. The N۷۱۹ dye is the most common dye used in DSSCs. The resultsobtained from the I-V curve indicate a ۷۰۰ mV open-circuit voltage (Voc), an ۸.۵۷ mAshort-circuit current (Isc), a ۷۰% fill factor (FF) and a ۴.۲% efficiency for the N۷۱۹sample. Blackberry is a natural dye which has no toxic effects in comparison with theindustrial samples. The results obtained from the blackberry cell experiment indicate a۷۷۰ mV Voc, a ۲.۰۸ mA Isc, a ۷۰% FF and a ۱.۱۳% efficiency.

Dye-Sensitized Solar Cell, Pigment, Natural Blackberry Dye, The N۷۱۹ Dye, Efficiency