Competition between Radiative Power and Dissipation Power in the Refrigeration Process in Oxide Multifilms

The maximum refrigeration power dependence on the doping density in the p-BaTiO₃/BaTiO₃/SrTiO₃/BaTiO₃/ n-BaTiO₃ system and in the p-AlGaAs/AlGaAs/GaAs/AlGaAs/n-AlGaAs system is obtained respectively based on the opto-thermionic refrigeration model. The results show that the maximum refrigeration power in the p-BaTiO₃/BaTiO₃/SrTiO₃/BaTiO₃/n-BaTiO₃ system increases dramatically with the increase of doping density from 1.0×10¹⁸ cm^-3 to 5.0×10¹⁹ cm^-3 while that in the p-AlGaAs/AlGaAs/GaAs/AlGaAs/n-AlGaAs system is nearly a constant. It is found that the different Auger coefficients and the competition between radiative power and dissipation power lead to the different behavior of the maximum refrigeration power dependence on the doping density of the two systems.