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Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics / Trystan, Watson; Matthew, Davies; James, Durrant; Zhe, Li; Wing Chung, Tsoi; Catherine, De Castro

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

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

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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
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa34428
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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 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.
Keywords: fullerene films, triplet exciton kinetics, PC61BM blend films, photo-oxidation
College: College of Engineering
Issue: 27
Start Page: 22739
End Page: 22747