Dye sensitized solar cells are currently attracting widespread academic and commercial interest for the conversion of sunlight into electricity because of their low cost and high efficiency. Among them, the performance of DSSCs based on organic dyes have been remarkably improved. Organic dyes have many advantages as photosensitizers, such as large molar extinction coefficient, control of absorption wavelength, facile design and synthesis, and lower cost than those of ruthenium complexes. Therefore, it is expected that organic dyes could compete with ruthenium complexes in the near future. So, We report that a combined experimental and computational study of several ruthenium(II) sensitizers and organic sensitizers.