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Cross-plane thermal conductivity temperature dependence for PbSnSe/PbSe thin film superlattice material from 100K to 300K

Published online by Cambridge University Press:  19 April 2013

James D. Jeffers
Affiliation:
School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019
Leonard Olona
Affiliation:
School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019
Zhihua Cai
Affiliation:
School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019
Khosrow Namjou
Affiliation:
School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019
Patrick J. McCann
Affiliation:
School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019
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Abstract

The temperature dependence of cross-plane lattice thermal conductivity for thin film IV-VI semiconductors grown by molecular beam epitaxy was measured. Samples consisting of PbSe/PbSrSe multiple quantum wells (MQWs) on PbSe/PbSnSe superlattices (SLs) were grown with variations in SL layer thickness and the number of SL pairs. Localized lattice temperatures within the MQW layers were extracted from analysis of continuous wave photoluminescence (PL) emission spectra at heat sink temperatures between 100 K and 250 K. These data, finite element analysis, and electrical characterization were used to determine cross-plane lattice thermal conductivity of two different SL materials. A SL material with three different PbSe/PbSnSe thicknesses (1.2/1.2, 1.8/1.8, and 2.4/2.4 nm) exhibited a fairly constant lattice thermal conductivity from 1.2 to 1.3 W/mK as the sample was cooled from 250 K to 100 K. Another SL material with five different PbSe/PbSnSe thicknesses (0.5/0.5, 1.0/1.0, 1.6/1.6, 2.1/2.1, and 2.6/2.6 nm) exhibited very low lattice thermal conductivities from 0.46 to 0.47 W/mK 250 K to 100 K. These results are consistent with reflection of low energy heat transporting acoustic phonons within the SL material.

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Copyright
Copyright © Materials Research Society 2013

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Cross-plane thermal conductivity temperature dependence for PbSnSe/PbSe thin film superlattice material from 100K to 300K
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