This textbook covers solar cells employing photoelectric dye molecules to harvest sunlight and convert the photons to charge carriers which produce electricity. It also examines dye-sensitized solar cells type molecular solar cells and includes sections on photochemistry, driving force, electron-transfer kinetics, charge carrier separation, charge transport processes, electrical contact properties, experimental techniques for characterization, etc. The principle of DSC has also become a part of the core-chemistry and energy science teaching and research. Many textbooks have sections or chapters dealing with DSC, this is the first devoted entirely to the subject.