Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics

Speller, Emily M.; McGettrick, James D.; Rice, Beth; Telford, Andrew M.; H., Harrison K.; Tan, Ching-Hong; Castro, Catherine De; Davies, Matthew; Watson, Trystan; Nelson, Jenny; Durrant, James; Li, Zhe; Tsoi, Wing C.; Tsoi, Wing Chung

doi:10.1021/acsami.7b03298

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Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics

Emily M. Speller, James D. McGettrick, Beth Rice, Andrew M. Telford, Harrison K. H. Lee, Ching-Hong Tan, Catherine De Castro

, Matthew Davies

, Trystan Watson

, Jenny Nelson, James Durrant

, Zhe Li

, Wing C. Tsoi, Wing Chung Tsoi

ACS Applied Materials & Interfaces, Volume: 9, Issue: 27, Pages: 22739 - 22747

Swansea University Authors: Catherine De Castro , Matthew Davies , Trystan Watson , James Durrant , Zhe Li , Wing Chung Tsoi

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DOI (Published version): 10.1021/acsami.7b03298

Abstract

The photochemistry and stability of fullerene ﬁlms is found to be 11 strongly dependent upon ﬁlm nanomorphology. In particular, PC61BM blend ﬁlms, 12 dispersed with polystyrene, are found to be more susceptible to photobleaching in 13 air than the more aggregated neat ﬁlms. This enhanced photobleach...

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Published in:	ACS Applied Materials & Interfaces
ISSN:	1944-8244 1944-8252
Published:	2017
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URI:	https://cronfa.swan.ac.uk/Record/cronfa34428
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spelling	2020-05-28T14:17:49.6509510 v2 34428 2017-06-21 Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics 9523c09d78056932bb9b6959b559323e 0000-0003-0649-3427 Catherine De Castro Catherine De Castro true false 4ad478e342120ca3434657eb13527636 0000-0003-2595-5121 Matthew Davies Matthew Davies true false a210327b52472cfe8df9b8108d661457 0000-0002-8015-1436 Trystan Watson Trystan Watson true false f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 56be57cc8dd661dfdbb921608cf93ded 0000-0002-7404-7448 Zhe Li Zhe Li true false 7e5f541df6635a9a8e1a579ff2de5d56 0000-0003-3836-5139 Wing Chung Tsoi Wing Chung Tsoi true false 2017-06-21 EEN The photochemistry and stability of fullerene ﬁlms is found to be 11 strongly dependent upon ﬁlm nanomorphology. In particular, PC61BM blend ﬁlms, 12 dispersed with polystyrene, are found to be more susceptible to photobleaching in 13 air than the more aggregated neat ﬁlms. This enhanced photobleaching correlated 14 with increased oxygen quenching of PC61BM triplet states and the appearance of a 15 carbonyl FTIR absorption band indicative of fullerene oxidation, suggesting 16 PC61BM photo-oxidation is primarily due to triplet-mediated singlet oxygen 17 generation. PC61BM ﬁlms were observed to undergo photo-oxidation in air for even 18 modest (≤40 min) irradiation times, degrading electron mobility substantially, 19 indicative of electron trap formation. This conclusion is supported by observation of 20 red shifts in photo- and electro-luminescence with photo-oxidation, shown to be in 21 agreement with time-dependent density functional theory calculations of defect 22 generation. These results provide important implications on the environmental stability of PC61BM-based ﬁlms and devices. Journal Article ACS Applied Materials & Interfaces 9 27 22739 22747 1944-8244 1944-8252 fullerene ﬁlms, triplet exciton kinetics, PC61BM blend ﬁlms, photo-oxidation 31 12 2017 2017-12-31 10.1021/acsami.7b03298 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2020-05-28T14:17:49.6509510 2017-06-21T15:40:33.9366397 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Emily M. Speller 1 James D. McGettrick 2 Beth Rice 3 Andrew M. Telford 4 Harrison K. H. Lee 5 Ching-Hong Tan 6 Catherine De Castro 0000-0003-0649-3427 7 Matthew Davies 0000-0003-2595-5121 8 Trystan Watson 0000-0002-8015-1436 9 Jenny Nelson 10 James Durrant 0000-0001-8353-7345 11 Zhe Li 0000-0002-7404-7448 12 Wing C. Tsoi 13 Wing Chung Tsoi 0000-0003-3836-5139 14 0034428-27062017101856.pdf speller2017(2)v2.pdf 2017-06-27T10:18:56.4530000 Output 1506120 application/pdf Accepted Manuscript true 2018-06-12T00:00:00.0000000 This is final publisher pdf and cannot be published to Cronfa according to http://www.sherpa.ac.uk/romeo/issn/1944-8244/ true eng
title	Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics
spellingShingle	Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics Catherine De Castro Matthew Davies Trystan Watson James Durrant Zhe Li Wing Chung Tsoi
title_short	Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics
title_full	Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics
title_fullStr	Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics
title_full_unstemmed	Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics
title_sort	Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics
author_id_str_mv	9523c09d78056932bb9b6959b559323e 4ad478e342120ca3434657eb13527636 a210327b52472cfe8df9b8108d661457 f3dd64bc260e5c07adfa916c27dbd58a 56be57cc8dd661dfdbb921608cf93ded 7e5f541df6635a9a8e1a579ff2de5d56
author_id_fullname_str_mv	9523c09d78056932bb9b6959b559323e_*_Catherine De Castro 4ad478e342120ca3434657eb13527636__Matthew Davies a210327b52472cfe8df9b8108d661457__Trystan Watson f3dd64bc260e5c07adfa916c27dbd58a__James Durrant 56be57cc8dd661dfdbb921608cf93ded__Zhe Li 7e5f541df6635a9a8e1a579ff2de5d56_*_Wing Chung Tsoi
author	Catherine De Castro Matthew Davies Trystan Watson James Durrant Zhe Li Wing Chung Tsoi
author2	Emily M. Speller James D. McGettrick Beth Rice Andrew M. Telford Harrison K. H. Lee Ching-Hong Tan Catherine De Castro Matthew Davies Trystan Watson Jenny Nelson James Durrant Zhe Li Wing C. Tsoi Wing Chung Tsoi
format	Journal article
container_title	ACS Applied Materials & Interfaces
container_volume	9
container_issue	27
container_start_page	22739
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institution	Swansea University
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description	The photochemistry and stability of fullerene ﬁlms is found to be 11 strongly dependent upon ﬁlm nanomorphology. In particular, PC61BM blend ﬁlms, 12 dispersed with polystyrene, are found to be more susceptible to photobleaching in 13 air than the more aggregated neat ﬁlms. This enhanced photobleaching correlated 14 with increased oxygen quenching of PC61BM triplet states and the appearance of a 15 carbonyl FTIR absorption band indicative of fullerene oxidation, suggesting 16 PC61BM photo-oxidation is primarily due to triplet-mediated singlet oxygen 17 generation. PC61BM ﬁlms were observed to undergo photo-oxidation in air for even 18 modest (≤40 min) irradiation times, degrading electron mobility substantially, 19 indicative of electron trap formation. This conclusion is supported by observation of 20 red shifts in photo- and electro-luminescence with photo-oxidation, shown to be in 21 agreement with time-dependent density functional theory calculations of defect 22 generation. These results provide important implications on the environmental stability of PC61BM-based ﬁlms and devices.
published_date	2017-12-31T03:42:43Z
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Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics

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