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Influence of selenium vapor postannealing on the electrical transport properties of PbSe–WSe2 nanolaminates

Published online by Cambridge University Press:  27 April 2011

Qiyin Lin ,
Sara Tepfer ,
Colby Heideman ,
Clay Mortensen ,
Ngoc Nguyen ,
Paul Zschack ,
Matt Beekman  and
David C. Johnson
Qiyin Lin
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon, 97403-1205
Sara Tepfer
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon, 97403-1205
Colby Heideman
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon, 97403-1205
Clay Mortensen
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon, 97403-1205
Ngoc Nguyen
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon, 97403-1205
Paul Zschack
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, 60439
Matt Beekman
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon, 97403-1205
David C. Johnson*
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon, 97403-1205
*
a)Address all correspondence to this author. e-mail: davej@uoregon.edu
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Abstract

The influence of annealing time and annealing temperature under controlled partial pressure of selenium on the in-plane electrical transport properties of specimens of [(PbSe)0.99]1[WSe2]1 turbostratic nanolaminates was studied. The annealing treatments were found to be very effective in reducing carrier concentrations and improving carrier mobility in the annealed films, which is attributed to the reduction of compositional and structural defects. As a result, room temperature Hall mobilities greater than 60 cm2 V−1·s−1 are observed in spite of the small in-plane domain sizes (on the order of 10 nm) that are related to the turbostratic disorder. The technique appears promising for decreasing the concentration of kinetically trapped defects in these and related self-assembled nanostructures, a key challenge to evaluating the expected potential for controlling electrical and thermal transport properties via designed nanostructure in these and related materials.

Keywords

ThermoelectricAnnealingElectrical properties
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 15: Focus Issue: Advances in Thermoelectric Materials , 14 August 2011 , pp. 1866 - 1871
Copyright
Copyright © Materials Research Society 2011

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References

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