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Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material

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Date
03/05/2017
Author
Long, Yun
Hedley, Gordon James
Ruseckas, Arvydas
Chowdhury, Mithun
Roland, Thomas Jean
Serrano, Luis
Cooke, Graeme
Samuel, Ifor David William
Keywords
Organic solar cells
Organic semiconductors
Light harvesting
Excitation energy transfer
Bulk heterojunctions
QC Physics
T Technology
NDAS
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Abstract
Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh2)2. Three complementary time-resolved fluorescence measurements were performed: quenching in planar heterojunctions with an electron acceptor; exciton-exciton annihilation; and fluorescence depolarization. The average exciton diffusivity increases upon annealing from 1.6 × 10-3 cm2 s-1 to 3.6 × 10-3 cm2 s-1, resulting in an enhancement of the mean two–dimensional exciton diffusion length (LD=√4Dτ) from 15 nm to 27 nm. About 30% of the excitons get trapped very quickly in as-cast films. The high exciton diffusion coefficient of the material leads to it being able to harvest excitons efficiently from large donor domains in bulk heterojunctions.
Citation
Long , Y , Hedley , G J , Ruseckas , A , Chowdhury , M , Roland , T J , Serrano , L , Cooke , G & Samuel , I D W 2017 , ' Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material ' , ACS Applied Materials & Interfaces , vol. 9 , no. 17 , pp. 14945-14952 . https://doi.org/10.1021/acsami.6b16487
Publication
ACS Applied Materials & Interfaces
Status
Peer reviewed
DOI
https://doi.org/10.1021/acsami.6b16487
ISSN
1944-8244
Type
Journal article
Rights
© 2017 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.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/10749

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