Efficiency at maximum power of thermoelectric heat engines with the symmetric semiconductor superlattice

Efficiency at maximum power (EMP) is a very important specification for heat engine to evaluate the capacity of outputting adequate with high efficiency. It has been proved theoretically that limit EMP thermoelectric can be achieved hypothetical boxcar-shaped electron transmission, which realized here by resonant tunneling in one-dimensional symmetric InP/InSe superlattice. found transfer matrix method mode robust regardless periodicity, and obtained boxcar-like transmission stems from strong coupling between Fabry-P\'erot modes inside allowed band. High uniformity sharp drop edge are both beneficial EMP, optimized bias voltage thicknesses barrier well. The extracted help machine learning technique, more than 95% their theoretical limits smaller temperature difference, width larger well width. We hope obtain results could provide some basic guidance future designs engines.