In this work, bistable devices were fabricated from eggshell-derived calcium oxide (CaO). CaO powders can be obtained from the calcination of chicken eggshells at temperatures from 700-1000 °C. The properties of derived CaO were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy. CaO was composited with polyvinylpyrrolidone (PVP) polymer to fabricate a bistable device with the device structure of ITO/PVP:CaO/Al. The maximum ON/OFF current ratio for the device was approximately 10<sup>4</sup>. In addition, the retention time operations reached higher than 10<sup>4</sup> s, which revealed the stability of the bistable device. The theoretical model and conduction mechanisms were presented to explain the behavior of the bistable device.
