Charge transport in lead sulfide quantum dots/phthalocyanines hybrid nanocomposites

Pal, Chandana, Sosa-Vargas, Lydia, Ojeda, Jesús J., Sharma, Ashwani K., Cammidge, Andrew N., Cook, Michael J. and Ray, Asim K. (2017) Charge transport in lead sulfide quantum dots/phthalocyanines hybrid nanocomposites. Organic Electronics, 44. pp. 132-143. ISSN 1566-1199

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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.

Item Type: Article
Uncontrolled Keywords: bohr radius,quantum confinement,photophysical quenching,percolation limit,hopping conduction,memristors
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Pure Connector
Date Deposited: 16 Feb 2017 02:24
Last Modified: 11 Nov 2021 01:47
DOI: 10.1016/j.orgel.2017.02.014

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