Carrier Lifetime Enhancement in a Tellurium Nanowire/PEDOT

PSS Nanocomposite by Sulfur Passivation

James N. Heyman, Ayaskanta Sahu, Nelson E. Coates, Brittany Ehraann, Jeffeiy J. Urban

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

Abstract

We report static and time-resolved terahertz (THz) conductivity measurements of a high- performance thermoelectric material containing tellurium nanowires in a PEDOT:PSS matrix. Composites were made with and without sulfur passivation of the nanowires surfaces. The material with sulfur linkers (TeNW/PD-S) is less conductive but has a longer carrier lifetime than the formulation without (TeNW/PD). We find real conductivities at/= ITHz of σTeNw/pd = 160 S/cm and σTeNw/PD-s = 5.1 S/cm. These values are much larger than the corresponding DC conductivities, suggesting DC conductivity is limited by structural defects. The free-carrier lifetime in the nanowires is controlled by recombination and trapping at the nanowire surfaces. We find surface recombination velocities in bare tellurium nanowires (22m/s) and TeNW/PD-S (40m/s) that are comparable to evaporated tellurium thin films. The surface recombination velocity in TeNW/PD (509m/s) is much larger, indicating a higher interface trap density.

Original languageEnglish (US)
Title of host publicationMolecular, Polymer and Hybrid Materials for Thermoelectrics
PublisherMaterials Research Society
Pages7-12
Number of pages6
Volume1742
ISBN (Electronic)9781510806221
DOIs
StatePublished - 2015
Event2014 MRS Fall Meeting - Boston, United States
Duration: Nov 30 2014Dec 5 2014

Other

Other2014 MRS Fall Meeting
CountryUnited States
CityBoston
Period11/30/1412/5/14

Fingerprint

Tellurium
Carrier lifetime
tellurium
carrier lifetime
Sulfur
Passivation
passivity
Nanowires
Nanocomposites
nanocomposites
nanowires
sulfur
augmentation
conductivity
direct current
thermoelectric materials
trapping
poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)
traps
formulations

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Heyman, J. N., Sahu, A., Coates, N. E., Ehraann, B., & Urban, J. J. (2015). Carrier Lifetime Enhancement in a Tellurium Nanowire/PEDOT: PSS Nanocomposite by Sulfur Passivation. In Molecular, Polymer and Hybrid Materials for Thermoelectrics (Vol. 1742, pp. 7-12). Materials Research Society. https://doi.org/10.1557/opl.2015.157

Carrier Lifetime Enhancement in a Tellurium Nanowire/PEDOT : PSS Nanocomposite by Sulfur Passivation. / Heyman, James N.; Sahu, Ayaskanta; Coates, Nelson E.; Ehraann, Brittany; Urban, Jeffeiy J.

Molecular, Polymer and Hybrid Materials for Thermoelectrics. Vol. 1742 Materials Research Society, 2015. p. 7-12.

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

Heyman, JN, Sahu, A, Coates, NE, Ehraann, B & Urban, JJ 2015, Carrier Lifetime Enhancement in a Tellurium Nanowire/PEDOT: PSS Nanocomposite by Sulfur Passivation. in Molecular, Polymer and Hybrid Materials for Thermoelectrics. vol. 1742, Materials Research Society, pp. 7-12, 2014 MRS Fall Meeting, Boston, United States, 11/30/14. https://doi.org/10.1557/opl.2015.157
Heyman JN, Sahu A, Coates NE, Ehraann B, Urban JJ. Carrier Lifetime Enhancement in a Tellurium Nanowire/PEDOT: PSS Nanocomposite by Sulfur Passivation. In Molecular, Polymer and Hybrid Materials for Thermoelectrics. Vol. 1742. Materials Research Society. 2015. p. 7-12 https://doi.org/10.1557/opl.2015.157
Heyman, James N. ; Sahu, Ayaskanta ; Coates, Nelson E. ; Ehraann, Brittany ; Urban, Jeffeiy J. / Carrier Lifetime Enhancement in a Tellurium Nanowire/PEDOT : PSS Nanocomposite by Sulfur Passivation. Molecular, Polymer and Hybrid Materials for Thermoelectrics. Vol. 1742 Materials Research Society, 2015. pp. 7-12
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