The miniaturization of modern electronic devices has been approaching the nanoscale. This trend has led researchers to study and develop of single-molecule devices (SMDs), where molecules are employed as active components. Among these molecules, fullerenes and their derivatives distinguish for their distinctive cage-like structures. A single-molecule electret (SME) is a long-desired nanoscale component since it can conduct us to new small storage device with the feature of non-volatile memory. Its main attribute is the switching between two different states by means of an external electric field. Recent studies report a single-molecule electret device based on an endhoedral metallofullerene, demonstrating memory capabilities.