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Applied Physics Letters / Volume 87 / Issue 25 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 87, 253109 (2005); http://dx.doi.org/10.1063/1.2140885 (3 pages)

Carrier transport in PbS nanocrystal conducting polymer composites

Andrew Watt, Troy Eichmann, Halina Rubinsztein-Dunlop, and Paul Meredith

Soft Condensed Matter Physics Group and Centre for Biophotonics and Laser Science, School of Physical Sciences, University of Queensland, Brisbane, Australia

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(Received 14 February 2005; accepted 1 November 2005; published online 14 December 2005)

In this letter we report the carrier mobilities in an inorganic nanocrystal: conducting polymer composite. The composite material in question (lead sulphide nanocrystals in the conducting polymer poly [2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) was made using a single-pot, surfactant-free synthesis. Mobilties were measured using time of flight techniques. We have found that the inclusion of PbS nanocrystals in MEH-PPV both balances and markedly increases the hole and electron mobilities—the hole mobility is increased by a factor of ∼ 105 and the electron mobility increased by ∼ 107 under an applied bias of 5 kV cm−1. These results explain why dramatic improvements in electrical conductivity and photovoltaic performance are seen in devices fabricated from these composites.

© 2005 American Institute of Physics

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KEYWORDS and PACS

Keywords

lead compounds, IV-VI semiconductors, conducting polymers, nanostructured materials, composite materials, electron mobility, hole mobility, time of flight spectra, inclusions, electrical conductivity, photovoltaic effects

PACS

  • 72.20.Fr

    Low-field transport and mobility; piezoresistance

  • 72.80.Tm

    Composite materials

  • 72.80.Le

    Polymers; organic compounds (including organic semiconductors)

  • 72.40.+w

    Photoconduction and photovoltaic effects

  • 61.72.Qq

    Microscopic defects (voids, inclusions, etc.)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2140885

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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