Based on full quantum-transport simulations, we report a comprehensive study of the evaporative cooling process in a double-barrier semiconductor heterostructure thermionic refrigerator. Our model, which self-consistently solves the nonequilibrium Green’s function framework and the heat equation, is capable of calculating the electron temperature and electrochemical potential inside the device.

We investigate electron transport in asymmetric double-barrier AlGaAs/GaAs thermionic cooling heterostructures (Fig.1). Measurements of temperature-dependent current-voltage characteristics confirm that the dominant electron trans

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