This project focuses on developing lightweight, flexible shape, and inexpensive thin film type photovoltaic devices based on the following materials. (a) Polymer thin films with nano-phase separated block co-polymer systems containing donor and acceptor phases such as derivatized polythiophene compounds. (b) Hybrid organic or polymeric/inorganic photovoltaic thin film materials. The photovoltaic materials find its key applications in solar (or light) energy conversion on earth and in space flight missions. For instance, solar panes are the main power sources for man-made satellites and space station. For human beings on earth, solar energy is an unlimited an non-polluting energy source. The polymeric nonlinear optical materials are critical for future high-speed photonic signal processing devices and information superhighway development.