With the decrease of fossil fuels as the main energy supplier of the earth and the prediction of the end of these fuels in the next hundred years, new or renewable energies are a good alternative to fossil fuels. Solar cells are a clear example of new energy by directly converting the sun's energy into electricity. The ever-increasing design and development of solar cells is not only limited to experimental and laboratory work, but numerical modeling has also been involved in this matter. The purpose of this thesis is to design and numerically model pigmented solar cells based on a semiconductor nanostructure layer with a wide bandgap (titanium dioxide) and zinc oxide as the electron transfer layer and artificial pigment N719. The ruthenium base is used as the absorbent layer, as well as the organic compounds PEDOT:PSS and P3HT:PC61BM as the hole transporting material. In this research, the advanced Camsol software with a wide platform was used for the design of the pigment solar cell and the current-voltage characteristics as well as the optical absorption of the cell were calculated, which are consistent with the experimental data. In this numerical simulation, several cells with different structures have been designed, and the efficiency and characteristics of all of them have been calculated. Finally, the optimal structure is a cell with layers of transparent conductive glass made of tin oxide doped with indium, titanium dioxide as an electron conductive layer, artificial pigment N719 as an absorbent layer, and PEDOT:PSS organic compound as a hole conductive layer and platinum. The title of the metal electrode was determined. The optimal cell short circuit current was 17.3 mA, its open circuit voltage was 1.87 V, the cell efficiency was 29.2%, and the maximum absorption rate was calculated as 0.83 W/m. Also, in a number of cells, the thickness of the active layer was changed and by increasing and decreasing the thickness and calculating the current-voltage chara