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Title: Multilayer thermoelectric films: A strategy for the enhancement of ZT

Abstract

The relative efficiency of a thermoelectric material is measured in terms of a dimensionless figure of merit, ZT. Although all known thermoelectric materials are believed to have ZT {le} 1, recent theoretical results predict that thermoelectric devices fabricated as two-dimensional quantum wells (2D QWs) could have ZT {ge} 3. Multilayers with the dimensions of 2D QWs have been synthesized by alternately sputtering Bi{sub 0.9}Sb{sub 0.1} and PbTe{sub 0.8}Se{sub 0.2} onto a moving substrate from a pair of magnetron sources. These materials have been synthesized to test the thermoelectric quantum-well concept and gain insight into relevant transport mechanisms. This work focuses primarily on the scientific issues involved in producing the materials necessary to examine the possibility of enhancing ZT using quantum confinement. The techniques needed to measure the relevant electrical parameters of thermoelectric thin films are developed in this paper. Ultimately, if a quantum well enhancement of thermoelectrics is experimentally observed, devices based on this technology could be used to greatly expand the role of thermoelectrics in power generation and refrigeration.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
71575
Report Number(s):
UCRL-JC-120255; CONF-950729-3
ON: DE95011535
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 30. intersociety energy conversion engineering conference, Orlando, FL (United States), 30 Jul - 5 Aug 1995; Other Information: PBD: Mar 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 66 PHYSICS; THERMOELECTRIC MATERIALS; EFFICIENCY; THIN FILMS; BISMUTH BASE ALLOYS; ANTIMONY ALLOYS; SPUTTERING; X-RAY DIFFRACTION; TEMPERATURE DEPENDENCE; TELLURIUM ALLOYS; SELENIUM ALLOYS; LEAD ALLOYS; MODIFICATIONS

Citation Formats

Wadgner, A V, Foreman, R J, Summers, L J, Barbee, Jr, T W, and Farmer, J C. Multilayer thermoelectric films: A strategy for the enhancement of ZT. United States: N. p., 1995. Web.
Wadgner, A V, Foreman, R J, Summers, L J, Barbee, Jr, T W, & Farmer, J C. Multilayer thermoelectric films: A strategy for the enhancement of ZT. United States.
Wadgner, A V, Foreman, R J, Summers, L J, Barbee, Jr, T W, and Farmer, J C. Wed . "Multilayer thermoelectric films: A strategy for the enhancement of ZT". United States. https://www.osti.gov/servlets/purl/71575.
@article{osti_71575,
title = {Multilayer thermoelectric films: A strategy for the enhancement of ZT},
author = {Wadgner, A V and Foreman, R J and Summers, L J and Barbee, Jr, T W and Farmer, J C},
abstractNote = {The relative efficiency of a thermoelectric material is measured in terms of a dimensionless figure of merit, ZT. Although all known thermoelectric materials are believed to have ZT {le} 1, recent theoretical results predict that thermoelectric devices fabricated as two-dimensional quantum wells (2D QWs) could have ZT {ge} 3. Multilayers with the dimensions of 2D QWs have been synthesized by alternately sputtering Bi{sub 0.9}Sb{sub 0.1} and PbTe{sub 0.8}Se{sub 0.2} onto a moving substrate from a pair of magnetron sources. These materials have been synthesized to test the thermoelectric quantum-well concept and gain insight into relevant transport mechanisms. This work focuses primarily on the scientific issues involved in producing the materials necessary to examine the possibility of enhancing ZT using quantum confinement. The techniques needed to measure the relevant electrical parameters of thermoelectric thin films are developed in this paper. Ultimately, if a quantum well enhancement of thermoelectrics is experimentally observed, devices based on this technology could be used to greatly expand the role of thermoelectrics in power generation and refrigeration.},
doi = {},
url = {https://www.osti.gov/biblio/71575}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {3}
}

Conference:
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