Abstract: An electric energy storage device has first and second conductor layers, a plastic sheet, a quantum dot, and positive and negative electrodes wherein the first and second conductor layers has surfaces coated with ionic or dipole material. The first conductor layer is stacked on top of the second conductor layer with a nanometer-scale interval and with the ionic material layer inbetween, forming a bilayer structure and a quantum heterostructure. Millions of bilayers are stacked together to form a multilayer structure. A positive electrode is attached to the first conductor layer and a negative electrode is attached to the last conductor layer, wherein the first and second conductor layers store electrical energy in the bilayer in a form of binding energy.