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Physical mechanisms responsible for the water-induced degradation of PC<inf>61</inf>BM P3HT photovoltaic thin films

Parnell, AJ and Cadby, AJ and Dunbar, ADF and Roberts, GL and Plumridge, A and Dalgliesh, RM and Skoda, MWA and Jones, RAL (2016) Physical mechanisms responsible for the water-induced degradation of PC<inf>61</inf>BM P3HT photovoltaic thin films. Journal of Polymer Science, Part B: Polymer Physics, 54. pp. 141-146. ISSN 0887-6266

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Abstract

© 2015 Wiley Periodicals, Inc. We show that [6,6]-phenyl-C61-butyric acid methyl ester (PC 61 BM) at the surface of thin film blends of poly(3-hexylthiophene) (P3HT):PC 61 BM can be patterned by water. Using a series of heating and cooling steps, water droplets condense onto the blend film surface. This is possible due to the liquid-like, water swollen layer of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate. Breath pattern water deformation and subsequent drying on the film surface results in isolated PC 61 BM structures, showing that migration of PC 61 BM takes place. This was confirmed by selective wavelength illumination to spatially map the photoluminescence from the P3HT and PC 61 BM. Within a device, redistribution of the surface PC 61 BM into aggregates would be catastrophic, as it would markedly alter device performance. We also postulate that repeated volume change of the poly(3,4-ethylenedioxythiophene) polystyrene sulfonate layer by water swelling may be, in part, responsible for the delamination failure mechanism in thin film solar cells devices .

Item Type: Article
Uncontrolled Keywords: nanocomposites Fullerenes conjugated polymers degradation neutron reflectivity
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:58
Last Modified: 14 Jun 2018 01:59
DOI: