Colossal permittivity materials

Doping for superior dielectrics

The search for materials with colossal permittivity for use in capacitors has been met with limited success. A newly discovered co-doped titanium oxide material has an extremely high permittivity and negligible dielectric losses, and is likely to enable further scaling in electronic and energy-storage devices.

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Figure 1: Ambipolar co-doping in a rutile structure where electron donors (Nb5+) create diamond-like complexes; the oxygen vacancies associated with the acceptors (In3+) result in triangular complexes2.

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Correspondence to Christopher C. Homes or Thomas Vogt.

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Homes, C., Vogt, T. Doping for superior dielectrics. Nature Mater 12, 782–783 (2013). https://doi.org/10.1038/nmat3744

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