Effect of Annealing on Exciton Diffusion in a High Performance Small Molecule Organic Photovoltaic Material

[Image: see text] Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh(2))(2). Three complementary time-resolved fluorescence measurements were performed: quenching in planar heterojunctions with an electron acceptor, exciton–exciton annihilat...

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Autores principales: Long, Yun, Hedley, Gordon J., Ruseckas, Arvydas, Chowdhury, Mithun, Roland, Thomas, Serrano, Luis A, Cooke, Graeme, Samuel, Ifor D. W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2017
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5423077/
https://www.ncbi.nlm.nih.gov/pubmed/28358189
http://dx.doi.org/10.1021/acsami.6b16487
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author Long, Yun
Hedley, Gordon J.
Ruseckas, Arvydas
Chowdhury, Mithun
Roland, Thomas
Serrano, Luis A
Cooke, Graeme
Samuel, Ifor D. W.
author_facet Long, Yun
Hedley, Gordon J.
Ruseckas, Arvydas
Chowdhury, Mithun
Roland, Thomas
Serrano, Luis A
Cooke, Graeme
Samuel, Ifor D. W.
author_sort Long, Yun
collection PubMed
description [Image: see text] Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh(2))(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) to 3.6 × 10(–3) cm(2) s(–1), resulting in an enhancement of the mean two-dimensional exciton diffusion length (L(D) = (4Dτ)(1/2)) from 15 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.
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spelling pubmed-54230772017-05-10 Effect of Annealing on Exciton Diffusion in a High Performance Small Molecule Organic Photovoltaic Material Long, Yun Hedley, Gordon J. Ruseckas, Arvydas Chowdhury, Mithun Roland, Thomas Serrano, Luis A Cooke, Graeme Samuel, Ifor D. W. ACS Appl Mater Interfaces [Image: see text] Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh(2))(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) to 3.6 × 10(–3) cm(2) s(–1), resulting in an enhancement of the mean two-dimensional exciton diffusion length (L(D) = (4Dτ)(1/2)) from 15 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. American Chemical Society 2017-03-30 2017-05-03 /pmc/articles/PMC5423077/ /pubmed/28358189 http://dx.doi.org/10.1021/acsami.6b16487 Text en Copyright © 2017 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
spellingShingle Long, Yun
Hedley, Gordon J.
Ruseckas, Arvydas
Chowdhury, Mithun
Roland, Thomas
Serrano, Luis A
Cooke, Graeme
Samuel, Ifor D. W.
Effect of Annealing on Exciton Diffusion in a High Performance Small Molecule Organic Photovoltaic Material
title Effect of Annealing on Exciton Diffusion in a High Performance Small Molecule Organic Photovoltaic Material
title_full Effect of Annealing on Exciton Diffusion in a High Performance Small Molecule Organic Photovoltaic Material
title_fullStr Effect of Annealing on Exciton Diffusion in a High Performance Small Molecule Organic Photovoltaic Material
title_full_unstemmed Effect of Annealing on Exciton Diffusion in a High Performance Small Molecule Organic Photovoltaic Material
title_short Effect of Annealing on Exciton Diffusion in a High Performance Small Molecule Organic Photovoltaic Material
title_sort effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5423077/
https://www.ncbi.nlm.nih.gov/pubmed/28358189
http://dx.doi.org/10.1021/acsami.6b16487
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