Inverted vs Standard PTB7:PC70BM Organic Photovoltaic Devices. The benefit of highly selective and extracting contacts in device performance
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Otros documentos de la autoría: Etxebarria, Ikerne; Guerrero, Antonio; Albero, Josep; Garcia-Belmonte, Germà; Palomares, Emilio; Pacios, Roberto
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Título
Inverted vs Standard PTB7:PC70BM Organic Photovoltaic Devices. The benefit of highly selective and extracting contacts in device performanceAutoría
Fecha de publicación
2014Editor
ElsevierISSN
1566-1199; 1878-5530Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.sciencedirect.com/science/article/pii/S1566119914003267#Versión
info:eu-repo/semantics/submittedVersionPalabras clave / Materias
Resumen
In this work we compare the photovoltaic performance of different cell designs, standard
and inverted, for one of the most promising systems to achieve power conversion efficiencies
over 10% in polymer:fullerene ... [+]
In this work we compare the photovoltaic performance of different cell designs, standard
and inverted, for one of the most promising systems to achieve power conversion efficiencies
over 10% in polymer:fullerene single cells, namely PTB7:PC70BM. Impedance spectroscopy,
charge extraction and transient photovoltage are used in order to assign the electrical
losses initially observed in the current density–voltage curve and understand the main limitation
of every design. While inverted devices show competitive performance in terms of
charge generation, transport of carriers and also for charge collection at electrodes, standard
devices present additional resistive losses that are assigned to charge transfer issues
at the active layer/anode interface. This additional resistance increase the overall series
resistance of devices, lowers the fill factor and it is the ultimate responsible for the
observed reduced device performance of standard cells in comparison to inverted ones.
In this way, devices over 7.2% are reported with ZnO and MoO3 as interlayer electrodes that
act as improved highly selective and extracting contacts in comparison to standard PEDOT:PSS
and Ca/Ag. Contacts are thus electrically optimized. Additional improvement of
device performance must consider enhancement of intrinsic recombination properties of
the blend. Lower molecular weights and/or any residual catalyst impurities with respect
to other batches are the only limitation to reach record efficiencies as those shown in
recent works. [-]
Publicado en
Organic Electronics 15 (2014) 2756–2762Derechos de acceso
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