Nowadays, solar cells are widely used due to their advantages such as not needing fuel and being economical. Due to the growing need for energy sources and the non-renewability of fossil fuels, renewable energy sources have been given attention. Solar cells are electronic devices that convert sunlight directly into electrical energy. These cells have attracted the attention of scientists and they have provided solutions to increase the efficiency of these cells. The purpose of this thesis was to investigate the performance of pigment-sensitized solar cells using titanium dioxide nanoparticles coated with biological calcium carbonate. To prepare the coating paste, TiO2 nanoparticles concentrated by sol-gel and solvothermal methods were used. Also, core and shell nanoparticles of titanium dioxide and calcium carbonate were prepared by co-precipitation and composite methods, and jamio fruit and N719 pigment were used as pigments. Then, the performance of pigment solar cells was evaluated and investigated based on the type of synthesis. The average size of nanoparticles in sol-gel synthesis methods, solvothermal synthesis, co-precipitation shell core 1, co-precipitation shell core 2, biological carbonate composite and composite in titanium oxide/calcium carbonate biological, respectively, 81.92, 111.09, 6. 130, 116.89, 90.93 and 95.22 nm. Based on the characterization of current-voltage and size of nanoparticles in solar cells, the pigmented solar cell using a composite of biological calcium carbonate and TiO2 synthesized by the sol-gel method with N719 pigment had the highest efficiency (1.49%). In the comparison of cells based on the size of nanoparticles, titanium dioxide synthesized by sol-gel method had smaller nanoparticles than the soluthermal method. In terms of the time required for the synthesis process, the sol-gel synthesis took the shortest possible time and finally showed a relatively good structure. Also, among the Tio2@caco3 core-shell by co-precipitatio