Electret-based vibrational energy generator composed of polar molecules for OLED

Electret-based vibrational energy generators (E-VEGs) are of particular interest since they can generate electrical power from ambient vibration. A challenge is that the charging process is required for making the electret from a dielectric material, and the process is one of the main factors that determine the manufacturing costs of the device. Recently, by utilizing the spontaneous orientation of polar molecules, which have been used for organic light-emitting diodes, we realized a novel E-VEG that does not require any charging process. In this paper, the operation mechanism and stability of the device are discussed. We believe that the E- VEG using spontaneous orientation enables us to reduce the costs, leading to the device's mass commercialization.