Sharma, Shailesh N. and Mehta, Aarti and Chand, Suresh (2014) Ligand-exchange dependent properties of hybrid nanocomposites based on luminescent colloidal CdSe nanocrystals in P3HT matrix. Colloid and Polymer Science, 292 (5). pp. 1153-1162. ISSN 0303-402X

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Abstract

In this work, a suitable ligand-exchange process has been proposed which elucidates the possibility to modulate charge/energy transfer rate between polymer and semiconductor quantum dots. The photoluminescence studies of CdSe emission as well as transient absorption measurements confirm mainly electron transfer for P3HT:CdSe (TOPO) and electron/energy transfer for P3HT:CdSe (OA) nanocomposites, respectively. The dominance of charge transfer for P3HT:CdSe (TOPO) as compared to P3HT:CdSe (OA) nanocomposites can be attributed to complete and partial removal of the surface ligands (TOPO, OA) upon ligand exchange with pyridine as elucidated from FTIR results. The various characterization techniques viz. Fourier transform infrared (FTIR), Raman, photoluminescence (PL), optical and transient absorption (UV-Vis and TA) spectroscopies used in this work provide an insight into the charge separation, charge accumulation and/or trapping of charge carriers for the better understanding of hybrid organic-inorganic photovoltaics. Composites of CdSe (OA) quantum dots in particular with P3HT polymer owing to its higher crystallinity and ordered morphology provide a new and promising direction toward developing effective light energy harvesting strategies in organic photovoltaics.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Springer Verlag.
Uncontrolled Keywords:	Charge/energy transfer P3HT CdSe quantum dots Ligand-exchange Tri-octylphosphine oxide (TOPO) Oleic acid (OA)
Subjects:	Polymer Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	19 Oct 2015 07:20
Last Modified:	19 Oct 2015 07:20
URI:	http://npl.csircentral.net/id/eprint/1371

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