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Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modification

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Samuel_2015_JCPL_Controlling_CC.pdf (1.465Mb)
Date
06/08/2015
Author
Sajjad, Muhammad Tariq
Ward, Alexander J.
Kästner, Christian
Ruseckas, Arvydas
Hoppe, Harald
Samuel, Ifor David William
Funder
EPSRC
European Research Council
EPSRC
Grant ID
EP/L015110/1
N/A
Keywords
Exciton diffusion length
Organic solar cells
Bulk heterojunction (BHJ)
Conjugated polymer
Crystallinity
QC Physics
NDAS
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Abstract
The influence of crystallinity on exciton diffusion and fullerene distribution was investigated by blending amorphous and semicrystalline copolymers. We measured exciton diffusion and fluorescence quenching in such blends by dispersing fullerene molecules into them. We find that the diffusion length is more than two times higher in the semicrystalline copolymer than in the amorphous copolymer. We also find that fullerene preferentially mixes into disordered regions of the polymer film. This shows that relatively small differences in molecular structure are important for exciton diffusion and fullerene distribution.
Citation
Sajjad , M T , Ward , A J , Kästner , C , Ruseckas , A , Hoppe , H & Samuel , I D W 2015 , ' Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modification ' , Journal of Physical Chemistry Letters , vol. 6 , no. 15 , pp. 3054-3060 . https://doi.org/10.1021/acs.jpclett.5b01059
Publication
Journal of Physical Chemistry Letters
Status
Peer reviewed
DOI
https://doi.org/10.1021/acs.jpclett.5b01059
ISSN
1948-7185
Type
Journal article
Rights
Copyright © 2015 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Description
The authors thank the European Research Council for financial support (grant number 321305). I.D.W.S. acknowledges a Royal Society Wolfson Research Merit Award. A.J.W. is thankful to the Scottish Doctoral Training Centre for financial support (grant number EP/L015110/1) and A.R. is thankful to EPSRC for financial support (grant number EP/J009016). C.K. acknowledges financial support from the “Thü ringer Landesgraduiertenschule für Photovoltaik” (PhotoGrad). C.K. and H.H. are grateful to the “Deutsche Forschungsgemeinschaft” (DFG) for financial support within the priority program SPP1355.
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  • University of St Andrews Research
URL
http://pubs.acs.org/doi/suppl/10.1021/acs.jpclett.5b01059
URI
http://hdl.handle.net/10023/7337

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