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Investigation of the valence band structure of PbSe by optical and transport measurement

Published online by Cambridge University Press:  15 February 2013

Thomas C. Chasapis ,
Yeseul Lee ,
Georgios S. Polymeris ,
Eleni C. Stefanaki ,
Euripides Hatzikraniotis ,
Xiaoyuan Zhou ,
Ctirad Uher ,
Konstantinos M. Paraskevopoulos  and
Mercouri G. Kanatzidis
Thomas C. Chasapis
Affiliation:
Department of Chemistry, Northwestern University, Evanston, Illinois, 60208, U.S.A.
Yeseul Lee
Affiliation:
Department of Chemistry, Northwestern University, Evanston, Illinois, 60208, U.S.A.
Georgios S. Polymeris
Affiliation:
Physics Department, Aristotle University of Thessaloniki, GR- 54124, Thessaloniki, Greece
Eleni C. Stefanaki
Affiliation:
Physics Department, Aristotle University of Thessaloniki, GR- 54124, Thessaloniki, Greece
Euripides Hatzikraniotis
Affiliation:
Physics Department, Aristotle University of Thessaloniki, GR- 54124, Thessaloniki, Greece
Xiaoyuan Zhou
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.
Ctirad Uher
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.
Konstantinos M. Paraskevopoulos
Affiliation:
Physics Department, Aristotle University of Thessaloniki, GR- 54124, Thessaloniki, Greece
Mercouri G. Kanatzidis
Affiliation:
Department of Chemistry, Northwestern University, Evanston, Illinois, 60208, U.S.A.
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Abstract

We investigated the valence band structure of PbSe by a combined study of the optical and transport properties of p-type Pb1-xNaxSe, with Na concentrations ranging from 0 – 4%, yielding carrier densities in a wide range of 1018 – 1020 cm−3. Room temperature infrared reflectivity studies showed that the susceptibility (or conductivity) effective mass m* increases from ∼ 0.06mo to ∼ 0.5mo on increasing Na content from 0.08% to 3%. The Seebeck coefficient scales with doping in the whole temperature range, yielding lower values for higher Na contents, while the Hall coefficient increases on heating from room temperature showing a peak close to 650 K. The room temperature Pisarenko plot is well described by the simple parabolic band model up to ∼ 1·1020 cm−3. In order to describe the behaviour in the whole concentration range, the application of the two band model, i.e. light hole and heavy hole, was used giving density of states effective masses 0.28mo and 2.5mo for the two bands respectively.

Keywords

optical propertiesthermoelectricsemiconducting
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1490: Symposium B – Thermoelectric Materials Research and Device Development for Power Conversion and Refrigeration , 2013 , pp. 75 - 81
Copyright
Copyright © Materials Research Society 2013 

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References

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