Frequency dependent electron damping in n-type PbSe

Th C. Hasapis, J. Androulakis, E. Hatzikraniotis, K. M. Paraskevopoulos, M. G. Kanatzidis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this work we study the infrared (IR) optical properties of n-type PbSe samples doped with Cl exhibiting an electron carrier density in the range 0.75×1019 cm-3-3.8×1019 cm -3. The IR reflectivity spectra are dominated by free carriers giving rise to blue-shifted reflectivity minimum in the region > 700cm -1. The analysis of the experimental reflectivity spectra showed that the conventional Drude model with a constant carrier relaxation time failed to describe the behaviour in the whole frequency range. It was found that the lineshape of the reflectivity spectra can be better described by a frequency dependent electron damping parameter with resonant-like behaviour similar to the one observed in the case of resonant electron scattering off potential wells. The density of states effective mass was found to increase with increasing carrier concentration supporting the non-parabolicity of the band model for PbSe.

Original languageEnglish
Title of host publication9th European Conference on Thermoelectrics, ECT 2011
Pages155-158
Number of pages4
DOIs
Publication statusPublished - Dec 1 2012
Event9th European Conference on Thermoelectrics, ECT 2011 - Thessaloniki, Greece
Duration: Sep 28 2011Sep 30 2011

Publication series

NameAIP Conference Proceedings
Volume1449
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other9th European Conference on Thermoelectrics, ECT 2011
CountryGreece
CityThessaloniki
Period9/28/119/30/11

Keywords

  • Free carrier effective mass
  • Infrared Reflectivity
  • Thermoelectric PbSe

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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