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R&D Association for Future Electron Devices

R&D Projects

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Quantum Functional Devices(1991-2000)

Quantum Functional Devices (QFD) are innovative multifunctional ultra high-speed devices realized by controlling quantum effects such as tunnelling, interference of electron waves, and discrete energy levels appearing in ultra-fine structures. The purpose of this project is to establish basic technologies for QFD, and to develop fabrication technologies for ultra small devices and integration technologies for systems of QFD. The project has a ten-year R&D schedule which is divided into the three phases: i) basic technologies for device elements, ii) implementation of elemental devices, and iii) advances in performance of the devices. This project has already produced results that have attracted considerable interest, the most important of which are as follows:

(1) The realization of silicon quantum wires and boxes with the size of a few tens of atoms, which clearly display quantum effects.
(2) A nondestructive read/write operation via resonant tunnelling effects, for the test circuit of a memory cell capable of integration to Tera bits scale.
(3) A new transistor in which tunnelling effects can be controlled by a gate electrode.

QFD is being pursued in order to contribute to the information-oriented society of the 21st century.

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