Nowadays, economic development relies heavily on energy resources and energy technologies. Considerable efforts have been devoted to the design of novel materials for energy-related applications, especially the generation and storage of renewable energies such as solar energy. This course aims to provide students an introduction to the physics and applications of energy materials including semiconductor materials, photovoltaic materials, thermoelectric materials, as well as the materials for hydrogen technology. Emphasis will be put on the discussions of underlying physical mechanism, general performance, current limitations and challenges.