Publication

Current Rectification through a Single-Barrier Resonant-Tunneling Quantum Structure

Giorgio Margaritondo
1995
Journal Articles

Abstract

We propose a simple quantum structure which exhibits resonant tunneling under one bias and simple tunneling under the opposite one, thus acting as a rectifier. The diode consists of a single laterally-indented barrier. Due to its particular conduction-band profile, electrons undergo resonant tunneling when the bias creates a band-profile triangular well which can contain a resonant state aligned to the emitter Fermi energy. A diode with an active layer of approximate to 100 Angstrom, realized by AlGaAs/GaAs, has a Rectification Ratio, calculated at the current-peak bias at resonance, of approximate to 100. This value can be enhanced by putting in series several elements of this kind. (C) 1995 Academic Press Limited

Official source

https://infoscience.epfl.ch/entities/publication/ea2d008a-6346-4e14-bcd9-7e8921e25c7d

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Giorgio Margaritondo
1995
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/ea2d008a-6346-4e14-bcd9-7e8921e25c7d

About this result

Related concepts (32)

Quantum tunnelling

In physics, quantum tunnelling, barrier penetration, or simply tunnelling is a quantum mechanical phenomenon in which an object such as an electron or atom passes through a potential energy barrier that, according to classical mechanics, the object does not have sufficient energy to enter or surmount. Tunneling is a consequence of the wave nature of matter, where the quantum wave function describes the state of a particle or other physical system, and wave equations such as the Schrödinger equation describe their behavior.

Rectifier

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The reverse operation (converting DC to AC) is performed by an inverter. The process is known as rectification, since it "straightens" the direction of current. Physically, rectifiers take a number of forms, including vacuum tube diodes, wet chemical cells, mercury-arc valves, stacks of copper and selenium oxide plates, semiconductor diodes, silicon-controlled rectifiers and other silicon-based semiconductor switches.

Quantum well

A quantum well is a potential well with only discrete energy values. The classic model used to demonstrate a quantum well is to confine particles, which were initially free to move in three dimensions, to two dimensions, by forcing them to occupy a planar region. The effects of quantum confinement take place when the quantum well thickness becomes comparable to the de Broglie wavelength of the carriers (generally electrons and holes), leading to energy levels called "energy subbands", i.e.

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