This course will focus on energy conversion materials from the perspective of material scientists. It will involve an overview of energy, energy conversion methods including thermoelectrics, photovoltaics, triboelectrics and electrochemical with a focus on the history, state-of-the-art materials and devices and disruptive technologies. Introduction to energy, conservation of energy, law of thermodynamics are covered. The semiconductors for such applications are covered in each section i.e. for photovoltaics, thermoelectrics and piezoelectrics, fuel cells. Then the mechanisms of such devices, p-n junction, device architectures, electrodes, performance metrics and characterization methods are covered.