Thermoelectric material and thermoelectric device including the same

A thermoelectric device comprising:

• a thermoelectric material having a stack structure including alternately stacked at least two first and at least two second material layers, the at least two first material layers containing a carbon nano-material and the at least two second material layers containing a thermoelectric inorganic material, and at least one of the carbon nano-material and the thermoelectric inorganic material including a plurality of graphene nanoparticles, and
• at least one conductor extending along lateral side surfaces of the at least two first and the at least two second material layers, the at least one conductor directly contacting the lateral side surface of each of the at least two first and the at least two second material layers, the at least one conductor being configured to connect the lateral side surfaces of the at least two first and the at least two second material layers,
• wherein the plurality of graphene nanoparticles are nanoscale particles, at least some of the plurality of graphene nanoparticles are arranged in an in-plane direction of the at least two first material layers, and the plurality of graphene nanoparticles collectively form a layer structure,
• wherein adjacent two layers in the stack structure are in direct contact with each other in an out-of-plane direction, and
• wherein each of the at least two first and the at least two second material layers has a length in the in-plane direction of the at least two first material layers and a thickness in the out-of-plane direction, the length is greater than the thickness, the at least one conductor extends in the out-of-plane direction, and the at least one conductor directly contacts the at least two first material layers and the at least two second material layers.