Nanocapacitors

Mitigating the “Dead-layer” Effect:

According to the classical capacitance theory, as the distance between the parallel plates is reduced to nanoscale length, the capacitance of a nanocapacitor is expected to increase by several orders of magnitude. However, experimental measurements show rather unexpected results and the capacitance of nanocapacitors are found to be much lower than that predicted from classical theories. It appears as if a layer of very low permittivity (“dead layer”) is present at the metal/dielectric interface causing a dramatic drop in the overall capacitance. Recently, the low capacitance in nanocapacitors was more precisely attributed to flexoelectricity and screening penetration. We have designed a graded dielectric film that can mitigate the so called “dead-layer” effect [Li et. al, 2011].

Nanocapacitors

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