Effect of Host-Mobility Dependent Carrier Scattering on Thermoelectric Power Factors of Polymer Composites

Jeffrey Blackburn, Andrew Ferguson, Elisa Link, Kun Zhang, Shiren Wang, Jingjing Qiu, Xin Zhang, Brandon Weeks

Research output: Contribution to journalArticlepeer-review

25 Scopus Citations


The interfacial carrier scattering was thought to be ineffective in enhancing thermoelectric (TE) properties of polymer hybrids and there was also a lack of fundamental understanding of carrier scattering at polymer/polymer interfaces. Here we unravel the mechanism behind the role of polymer/polymer interfacial scattering on the TE properties through integration of computation and experiments. We discover that the effect of interfacial scattering at polymer/polymer interfaces on TE properties of polymer hybrids is strongly dependent on the carrier mobility of host polymers besides interfacial barriers. Only when the host carrier mobility is above a threshold, the effect of interfacial scattering on TE enhancement can be significant. Simulation suggests that the host mobility threshold is ~1 cm2V-1s-1 for PEDOT-based polymers. The polymer hybrid system of poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires/PEDOT was successfully employed to verify the theoretical results. These findings offer groundbreaking knowledge on polymer/polymer interfacial carrier-transport and will advance the design and fabrication of high-efficiency organic thermoelectric materials.

Original languageAmerican English
Pages (from-to)128-137
Number of pages10
JournalNano Energy
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© 2015 Elsevier Ltd.

NREL Publication Number

  • NREL/JA-5900-65448


  • Carrier scattering
  • Host mobility
  • Polymer hybrid
  • Thermoelectric


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