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Issue 21, 2015
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Opto-electronics of PbS quantum dot and narrow bandgap polymer blends

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Abstract

Here we report on the interaction between the narrow bandgap polymer [2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta-[2,1-b;3,4-b]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and lead sulphide (PbS) colloidal quantum dots (CQDs) upon photoexcitation. We show that the presence of both materials in a blend leads to a significant reduction of photoluminescence (PL) lifetime of the polymer. This observation is attributed, supported by transient absorption (TA) data, to an efficient electron transfer towards the QDs for excitons generated on the polymer. Furthermore, the ligand capping the QD surface exhibits a great impact on the dynamics of the PL, with the long-chain oleic acid (OA) largely suppressing any kind of interaction. By means of external quantum efficiency (EQE) measurements we find evidence that both components give rise to a contribution to the photocurrent, making this an interesting blend for future applications in hybrid organic–inorganic solar cells.

Graphical abstract: Opto-electronics of PbS quantum dot and narrow bandgap polymer blends

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Supplementary files

Article information


Submitted
17 Mar 2015
Accepted
28 Apr 2015
First published
28 Apr 2015

This article is Open Access

J. Mater. Chem. C, 2015,3, 5499-5505
Article type
Paper
Author version available

Opto-electronics of PbS quantum dot and narrow bandgap polymer blends

S. Kahmann, A. Mura, L. Protesescu, M. V. Kovalenko, C. J. Brabec and M. A. Loi, J. Mater. Chem. C, 2015, 3, 5499
DOI: 10.1039/C5TC00754B

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