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Issue 17, 2014
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Improved electronic coupling in hybrid organic–inorganic nanocomposites employing thiol-functionalized P3HT and bismuth sulfide nanocrystals

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Abstract

In this study, we employ a thiol-functionalized polymer (P3HT-SH) as a leverage to tailor the nanomorphology and electronic coupling in polymer–nanocrystal composites for hybrid solar cells. The presence of the thiol functional group allows for a highly crystalline semiconducting polymer film at low thiol content and allows for improved nanomorphologies in hybrid organic–inorganic systems when employing non-toxic bismuth sulfide nanocrystals. The exciton dissociation efficiency and carrier dynamics at this hybrid heterojunction are investigated through photoluminescence quenching and transient absorption spectroscopy measurements, revealing a larger degree of polaron formation when P3HT-SH is employed, suggesting an increased electronic interaction between the metal chalcogenide nanocrystals and the thiol-functionalized P3HT. The fabricated photovoltaic devices show 15% higher power conversion efficiencies as a result of the improved nanomorphology and better charge transfer mechanism together with the higher open circuit voltages arising from the deeper energy levels of P3HT-SH.

Graphical abstract: Improved electronic coupling in hybrid organic–inorganic nanocomposites employing thiol-functionalized P3HT and bismuth sulfide nanocrystals

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Article information


Submitted
27 Mar 2014
Accepted
17 Jun 2014
First published
19 Jun 2014

Nanoscale, 2014,6, 10018-10026
Article type
Paper
Author version available

Improved electronic coupling in hybrid organic–inorganic nanocomposites employing thiol-functionalized P3HT and bismuth sulfide nanocrystals

L. Martinez, S. Higuchi, A. J. MacLachlan, A. Stavrinadis, N. C. Miller, S. L. Diedenhofen, M. Bernechea, S. Sweetnam, J. Nelson, S. A. Haque, K. Tajima and G. Konstantatos, Nanoscale, 2014, 6, 10018
DOI: 10.1039/C4NR01679C

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