@inproceedings{2f17ec9c992a44adb66b3b326d8c5496,
title = "Carrier Lifetime Enhancement in a Tellurium Nanowire/PEDOT:PSS Nanocomposite by Sulfur Passivation",
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.",
author = "Heyman, {James N.} and Ayaskanta Sahu and Coates, {Nelson E.} and Brittany Ehraann and Urban, {Jeffeiy J.}",
note = "Publisher Copyright: {\textcopyright} 2015 Materials Research Society.; 2014 MRS Fall Meeting ; Conference date: 30-11-2014 Through 05-12-2014",
year = "2015",
doi = "10.1557/opl.2015.157",
language = "English (US)",
series = "Materials Research Society Symposium Proceedings",
publisher = "Materials Research Society",
pages = "7--12",
editor = "M. Kovalenko and R. Segalman and A. Carella and M. Chabinyc and J. Malen",
booktitle = "Molecular, Polymer and Hybrid Materials for Thermoelectrics",
}