Electrical storage device with negative capacitance
AssigneeNaMLab gGmbH
InventorMichael Hoffmann
Life of this patent
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Abstract
The energy density of capacitors can be increased by using a material with differential negative capacitance (NC), which was recently observed in FE materials. Described is a more general pathway towards improved electrostatic energy storage densities by engineering the capacitance non-linearity of electrostatic devices. The disadvantages of regular polarizable materials are overcome by using the NC effect, which ideally has no hysteresis losses, leading to a theoretical efficiency of 100%. By storing the energy mostly in an amorphous DE layer, the break-down field strength is much higher compared to pure FE or AFE storage capacitors. In addition, leakage current losses can be reduced by improving the morphology of the insulating materials used.
Claims23
An integrated circuit element comprising:
- a first electrode;
- a second electrode;
- a first dielectric layer having positive capacitance and disposed between the first and second electrodes;
- and
- a second dielectric layer adjacent to the first dielectric layer and comprising a polarizable material, the first dielectric layer being thicker than the second dielectric layer.
An integrated circuit element comprising:
- a first electrode;
- a second electrode;
- a first dielectric layer having positive capacitance and disposed between the first and second electrodes;
- and
- a second dielectric layer adjacent to the first dielectric layer and comprising a polarizable material at least partially in a differential negative capacitance state, wherein the polarizable material is an antiferroelectric or relaxor type material.
An energy storage element comprising:
- a first electrode;
- a second electrode;
- a first dielectric layer having positive capacitance and disposed between the first and second electrodes;
- and
- a second dielectric layer adjacent to the first dielectric layer and comprising a polarizable material, the first dielectric layer being thicker than the second dielectric layer.
An energy storage element comprising:
- a first electrode;
- a second electrode;
- a first dielectric layer having positive capacitance and disposed between the first and second electrodes;
- and
- a second dielectric layer adjacent to the first dielectric layer and comprising a polarizable material that is at least partially in a differential negative capacitance state, wherein the polarizable material is an antiferroelectric or relaxor type material.
Dependencies are inferred from the claim text.