Raising the superconducting transition temperature to a point where applications are practical is one of the most important challenges in science. In this review, we aim at gaining insights on the T_c controlling factors for a particular high-temperature superconductor family—the FeSe-based superconductors. In particular, we discuss the mechanisms by which the Cooper pairing temperature is enhanced from ∼8 K in bulk FeSe to ∼80 K in the interface between an atomic layer of FeSe and SrTiO₃. This includes the experimental hints and the theoretical simulation of the involved mechanisms. We end by applying these insights to suggest some possible high-temperature superconducting systems.

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