Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carrier Lifetime Enhancement in a Tellurium Nanowire/PEDOT:PSS
  Nanocomposite by Sulfur Passivation   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 f = 1THz of {\sigma}(TeNW/PD) = 160
S/cm and {\sigma}(TeNW/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.

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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex