Reprint of : Three-terminal heat engine and refrigerator based on superlattices

• Introduces thermoelectric device based on the mini-band structure of superlattices.
• Heat engine mode delivers a large power output compared to similar devices.
• Analysis of coefficient of performance of the refrigerator in nonlinear regime.
• Explicit treatment of phonon transport through the device.

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

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