This book provides a comprehensive overview of thin film structures in energy applications‎.‎ Each chapter contains both fundamentals principles for each thin film structure as well as the relevant energy application technologies‎.‎ The authors cover thin films for a variety of energy sectors including inorganic and organic solar cells‎,‎ DSSCs‎,‎ solid oxide fuel cells‎,‎ thermoelectrics‎,‎ phosphors and cutting tools‎.‎