Nanoscale mapping by electron energy-loss spectroscopy reveals evolution of organic solar cell contact selectivity
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Other documents of the author: Guerrero, Antonio; Pfannmöller, Martin; Kovalenko, Alexander; Ripollés Sanchis, Teresa; Heidari, Hamed; Bals, Sara; Kaufmann, Louis-Dominique; Bisquert, Juan; Garcia-Belmonte, Germà
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Title
Nanoscale mapping by electron energy-loss spectroscopy reveals evolution of organic solar cell contact selectivityAuthor (s)
Date
2015Publisher
ElsevierISSN
1566-1199; 1878-5530Type
info:eu-repo/semantics/articlePublisher version
http://ac.els-cdn.com/S1566119914005102/1-s2.0-S1566119914005102-main.pdf?_tid=d ...Version
info:eu-repo/semantics/submittedVersionSubject
Abstract
Organic photovoltaic (OPV) devices are on the verge of commercialization being long-term
stability a key challenge. Morphology evolution during lifetime has been suggested to be
one of the main pathways accounting ... [+]
Organic photovoltaic (OPV) devices are on the verge of commercialization being long-term
stability a key challenge. Morphology evolution during lifetime has been suggested to be
one of the main pathways accounting for performance degradation. There is however a lack
of certainty on how specifically the morphology evolution relates to individual electrical
parameters on operating devices. In this work a case study is created based on a thermodynamically
unstable organic active layer which is monitored over a period of one year
under non-accelerated degradation conditions. The morphology evolution is revealed by
compositional analysis of ultrathin cross-sections using nanoscale imaging in scanning
transmission electron microscopy (STEM) coupled with electron energy-loss spectroscopy
(EELS). Additionally, devices are electrically monitored in real-time using the non-destructive
electrical techniques capacitance–voltage (C–V) and Impedance Spectroscopy (IS). By
comparison of imaging and electrical techniques the relationship between nanoscale morphology
and individual electrical parameters of device operation can be conclusively discerned.
It is ultimately observed how the change in the cathode contact properties
occurring after the migration of fullerene molecules explains the improvement in the overall
device performance. [-]
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Organic Electronics 16 (2015) 227–233Rights
© 2014 Elsevier B.V. All rights reserved.
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