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Author Venkatasubramanian, R. ♦ Siivola, E. ♦ Colpitts, T. ♦ O'Quinn, B.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1999
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Superlattices ♦ Tellurium ♦ Transmission line measurements ♦ Transistors ♦ Thermal conductivity ♦ Thermoelectric devices ♦ Bismuth ♦ Electron mobility ♦ Transmission electron microscopy ♦ Conductivity measurement
Abstract We present the concept of phonon-blocking electron-transmitting structures, desirable for high-performance thermoelectric devices, with the measured properties of p-type Bi/sub 2/Te/sub 3//Sb/sub 2/Te/sub 3/ superlattice materials. Transmission electron microscopy data indicate that these superlattices are structurally nearly ideal; this is also supported by the in-plane carrier transport measurements which suggest that superlattices offer higher mobilities compared to alloy films. The cross-plane carrier transport has been evaluated by a transmission line model technique, adapted to measure the electrical conductivities normal to the plane of the thin films. From a phonon-transport point of view, the superlattices offer significantly reduced lattice thermal conductivities compared to that of alloys. Prototypal thermoelements have been prepared with these superlattice films and other reference materials. Peltier-effect differential temperatures in the range of 2 to 4K are inferred across the thermoelements during quasi-steady state current flow. Figure of merit (ZT), from isothermal cross-plane electrical resistivities and adiabatic Peltier voltages, in bulk, thin-film alloys, and superlattice thermoelements were /spl sim/1, /spl sim/0.4, and 1.6 to 3, respectively.
Description Author affiliation: Res. Triangle Inst., Research Triangle Park, NC, USA (Venkatasubramanian, R.)
ISBN 0780354516
ISSN 10942734
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 1999-08-29
Publisher Place USA
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 419.53 kB
Page Count 4
Starting Page 100
Ending Page 103

Source: IEEE Xplore Digital Library