This book focuses on dye-sensitized solar cells (DSSCs), which are considered to be highly promising as they are made of low cost materials with simple and economical manufacturing procedures and can be molded into malleable sheets. These cells have emerged as a new class of energy conversion tools, which represent the third generation of solar technology. The method of converting solar energy into electricity in these devices is quite distinctive. The energy conversion efficiency produced by the DSSCs is low, but, it has upgraded quickly in the last years. It is assumed that the DSSCs will take an admirable place in the large scale production for the future. This book covers various aspects related to DSSCs and examines investigations of dyes for dye sensitized solar cells: Ruthenium-Complex, Metal-Free, Metal-Complex Porphyrins and Natural Dyes, and also discusses its future possibilities in fabrication, doping and characterization of polyaniline and metal oxides.