Chapter1: Thin films of bismuth telluride based alloys.- Chapter2: Wearable thermoelectric devices.- Chapter3: Theory and simulations of lattice thermal conduction.- Chapter4: Fabrication and Thermoelectric Properties of PEDOT films and their composites.- Chapter5: Electric field thermopower modulation of 2D electron systems.- Chapter6: Transition-metal-nitride-based thin films as novel thermoelectric materials.- Chapter7: Thermoelectric modules based on oxide thin films.- Chapter8: Thermoelectric properties of Metal Chalcogenide nanosheets and nanofilms grown by Chemicals and Physical routes.- Chapter9: Thermoelectric oxides thin films with hopping transport.