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This work is part of the inter-laboratory collaboration to study the stability of seven distinct sets of state-of-the-art organic photovoltaic (OPV) devices prepared by leading research laboratories. All devices have been shipped to and degraded at RISØ-DTU up to 1830 hours in accordance with established ISOS-3 protocols under defined illumination conditions. In this work, we apply the Incident Photon-to-Electron Conversion Efficiency (IPCE) and the in situ IPCE techniques to determine the relation between solar cell performance and solar cell stability. Different ageing conditions were considered: accelerated full sun simulation, low level indoor fluorescent lighting and dark storage. The devices were also monitored under conditions of ambient and inert (N2) atmospheres, which allows for the identification of the solar cell materials more susceptible to degradation by ambient air (oxygen and moisture). The different OPVs configurations permitted the study of the intrinsic stability of the devices depending on: two different ITO-replacement alternatives, two different hole extraction layers (PEDOT:PSS and MoO3), and two different P3HT-based polymers. The response of un-encapsulated devices to ambient atmosphere offered insight into the importance of moisture in solar cell performance. Our results demonstrate that the IPCE and the in situ IPCE techniques are valuable analytical methods to understand device degradation and solar cell lifetime.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Publication date2012

Bibliographical note

This work has been supported by the Danish Strategic
Research Council (2104-07-0022), EUDP ( 64009-0050),
and the Danish National Research Foundation. Partial financial
support was also received from the European Commission as
part of the Framework 7 ICT 2009 collaborative project
HIFLEX (grant no. 248678), partial financial support from
the EUIndian framework of the ‘‘Largecells’’ project that
received funding from the European Commission’s Seventh
Framework Programme (FP7/2007–2013. grant no. 261936),
partial financial support was also received from the European
Commission as part of the Framework 7 ICT 2009 collaborative
project ROTROT (grant no. 288565) and from PVERA-NET
(project acronym POLYSTAR). To CONACYT (Mexico) for
the Ph.D. scholarship awarded to G. T.-E, to the Spanish
Ministry of Science and Innovation,MICINN-FEDER project
ENE2008-04373, to the Consolider NANOSELECT project
CSD2007-00041, to the Xarxa de Referencia en Materials
Avanc¸ats per a l’Energia, XaRMAE of the Catalonia Government
(Spain). RR and HH are grateful for financial support
from the Thuringian Ministry of Culture and the German
Federal Ministry of Education and Research in the frameworks
of FIPV II and PPP (contract number 13N9843),
respectively. DMT acknowledges generous support from the
Inger and Jens Bruun Foundation through The American–
Scandinavian Foundation.

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