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We propose a three terminal heat engine based on semiconductor superlatticesfor energy harvesting. The periodicity of the superlattice structure creates anenergy miniband, giving an energy window for allowed electron transport. Wefind that this device delivers a large power, nearly twice than the heat enginebased on quantum wells, with a small reduction of efficiency. This engine alsoworks as a refrigerator in a different regime of the system's parameters. Thethermoelectric performance of the refrigerator is analyzed, including thecooling power and coefficient of performance in the optimized condition. Wealso calculate phonon heat current through the system, and explore thereduction of phonon heat current compared to the bulk material. The directphonon heat current is negligible at low temperatures, but dominates over theelectronic at room temperature and we discuss ways to reduce it.

Three-terminal heat engine and refrigerator based on superlattices