There are many heats that are being thrown away around us. About 42% of Japan's exhaust heat is below 200°C, and recovery of these low-temperature exhaust heat is hardly progressing. This is because the places where low-temperature exhaust heat is emitted are dispersed in homes, subways, cars, and so on. Inorganic materials such as Bi-Te series that have been used for thermoelectric power generation are rare, expensive, and have no flexibility. Therefore, we focused on graphene, which is a carbon material with a two-dimensional structure. Graphene is a lightweight, flexible material that exhibits unique electrical properties near room temperature. Thermoelectric devices have improved performance by alternately connecting p-type and n-type semiconductor elements. However, since graphene is p-type doped in the atmosphere, there are few reports of stable realization of n-type in graphene.
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