How Can We Make Nanoscale Capacitors Even Smaller?

Because there is great interest in increased portability in consumer electronics, researchers are continually searching for ways to reduce the size of electronic devices, but capacitors have proved particularly problematic. Researchers have tried to use high-permittivity materials to achieve more capacitance in a smaller area, but nanoscale devices have yielded lower-than-expected capacitance values. These low values have limited the performance of thin-film capacitors and prevented further device miniaturization.

Nicola Spaldin, a professor in the Materials Department of the College of Engineering, and her collaborator, post-doctoral researcher Massimiliano Stengel, used quantum mechanical calculations to prove that a so-called "dielectric dead layer" at the metal-insulator interface is responsible for the observed capacitance reduction.

Spaldin and Stengel explain, in the October 12 issue of Nature, that the fundamental quantum mechanical properties of the interfaces are the root cause of the problem, and show that metals with good screening properties can be used to improve the properties. "Our results provide practical guidelines for minimizing the deleterious effects of the dielectric dead layer in nanoscale devices," they say.

The research was supported by the Materials Theory program of the Division of Materials Research at the National Science Foundation.