A thermoelectric device that can exhibit substantially high specific power density is provided. The device includes core having a p-type element made from carbon nanotube and an n-type element. The device also includes a heat plate in and a cool plate, between which the core can be positioned. The design of the thermoelectric device allows the device to operate at substantially high temperature and to generate substantially high power output, despite being light weight. A method for making the thermoelectric device is also provided.
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