The present energy crisis has forced scientists and governments to expand energy research in non-conventional energy resources. Among the various non-conventional energy sources suggested, the solar energy offers the best solutions particularly, the conversion of sunlight directly into electricity without causing changes in ecology and the environment. Many attempts were made and are being made to make advances in the theoretical and technological aspects of the conversion of solar energy into utilizable form. The photovoltaic technologies, especially photoelectrochemical route is still in...