Nano Archive

Nanostructured electrodes for energy conversion devices

Tavkhelidze, A. N. (2011) Nanostructured electrodes for energy conversion devices. Nano Studies, 3 . pp. 187-198. ISSN 1987-8826

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Recently, new quantum features have been studied in the area of nanostructured quantum wells (NQW). Periodic ridges on the surface of the layer impose additional boundary conditions on the electron wave function and reduce the quantum state density. Electrons, rejected from forbidden quantum states, have to occupy the states with higher energy. As a result, Fermi energy in NQW increases and work function (WF) decreases. We investigate low WF electrode, composed from a metal NQW layer and a base substrate. The substrate material was selected so that electrons were confined to the NQW. The WF value depends on ridge geometry and electron confinement. We calculate WF in the metal NQW films grown both on a semiconductor and metal substrates. In the case of semiconductor substrate, wide band gap materials are preferable as they allow more reduction in NQW work function. In the case of metal substrate, low Fermi energy materials are preferable. For most material pairs, the WF was reduced dramatically. Such structures, can serve as electrodes for room temperature thermionic and thermotunnel energy converters and coolers.

Item Type:Article
Subjects:Physical Science > Quantum phenomena
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
ID Code:11634
Deposited By:Professor Levan Chkhartishvili
Deposited On:05 Jan 2012 10:30
Last Modified:05 Jan 2012 10:30

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