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Charge transport in lead sulfide quantum dots/phthalocyanines hybrid nanocomposites

Chandana Pal, Lydia Sosa-Vargas, Jesus Ojeda Ledo Orcid Logo, Ashwani K. Sharma, Andrew N. Cammidge, Michael J. Cook, Asim K. Ray

Organic Electronics, Volume: 44, Pages: 132 - 143

Swansea University Author: Jesus Ojeda Ledo Orcid Logo

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DOI (Published version): 10.1016/j.orgel.2017.02.014

Abstract

A hybrid composite of non-aggregated lead sulfide (PbS) nanoparticles of average size 5.8 ± 1 nm embedded within a film of an octaalkyl substituted metal-free phthalocyanine (Compound 2) was prepared on interdigitated gold electrodes by mild acidic treatment of newly synthesised octasubstituted lead...

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Published in: Organic Electronics
ISSN: 1566-1199
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa32002
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Abstract: A hybrid composite of non-aggregated lead sulfide (PbS) nanoparticles of average size 5.8 ± 1 nm embedded within a film of an octaalkyl substituted metal-free phthalocyanine (Compound 2) was prepared on interdigitated gold electrodes by mild acidic treatment of newly synthesised octasubstituted lead phthalocyanine analogue (Compound 1) in solid state phase. This nanocomposite film shows an enhancement of in-plane electrical conductivity over that of a film of octaalkyl substituted metal-free phthalocyanine alone by nearly 65%. This observation is consistent with the formation of charge complex compound as indicated by Raman and XPS data. The presence of PbS in the composite was examined on the basis of XRD peak positions which are comparable with those of bulk PbS. A band gap of 2.22 eV was calculated from optical absorption data using Tauc's law, implying quantum confinement. The mono dispersal behaviour of PbS nanoparticles was established from TEM and XRD studies. The hopping conduction mechanism is found to be primarily responsible for charge transport in the hybrid nanocomposite film with the hopping distance larger than PbS diameter.
Keywords: Bohr radius; Quantum confinement; Photophysical quenching; Percolation limit; Hopping conduction; Memristors
College: Faculty of Science and Engineering
Start Page: 132
End Page: 143

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