NSTI Nanotech 2009

Enhanced conductivity in the films of ligand-tailored lead selenide nanocrystal quantum dots and wires

S. Jeong, W. Seo, J. Youn, C-S. Han
Korea Institute of Machinery and Materials, KR

Keywords: nanocrystal quantum dots, conductivity

Abstract:

Lead selenide semiconductor nanocrystal quantum dots (NQDs) offer possibilities of improving the efficiency of solar cells, by generating more carriers with incoming photons, or by extending the bandgap toward the infra-red region. However, past studies have revealed low electronic conductivity in NQD 2D arrays thereby resulting in performances typically inferior to that of those fabricated by conventional solid-state routes.1 Here we have prepared low dimensional lead chalcogenides which facilitate the carrier transport thereby resulting in enhance conductivity. Specifically, lead selenide nanocrystal quantum dots with band edge emission from 1.2 micrometer to around 2.5 micrometer and extended wire structures were synthesized using organometallic synthesis. Films of lead chalcogenides were fabricated to monitor electrical signatures. Surface state modulated NQDs and wires showed changes in their conductivity which can be ascribed to their extent of electronic coupling as well as spatial arrangement.
 
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