High energy density storage device

A method for manufacturing a device for storing electrical energy, said method comprising steps of:

• providing a conducting electrode layer;
• providing a dielectric layer;
• depositing, using a vapor deposition process, an electrically insulating layer comprising carbon formed into a diamond or diamond-like structure on either a surface of the dielectric layer or a surface of the first conducting layer, wherein
• said conducting electrode layer and said dielectric layer are configured such that said insulating layer electrically insulates said conducting layer from said dielectric layer.

A method for manufacturing a device for storing electrical energy, said method comprising steps of:

• providing a plurality of conducting electrode layers;
• providing a plurality of dielectric layers;
• depositing an electrically insulating layer comprising carbon formed into a diamond or diamond-like structure on either a surface of each dielectric layer and/or a surface of each conducting layer such that an electrically insulating layer is provided between each conducting electrode layer and any adjacent dielectric layer to electrically insulate each conducting electrode layers from any adjacent dielectric layers, wherein
• the plurality of conducting electrode layers and said plurality of dielectric layers are arranged such that each dielectric layer is sandwiched between two different ones of said conducting electrode layers.