Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 14, Issue 33, Pages 11824-11845Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp40821j
Keywords
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Funding
- Danish Strategic Research Council [2104-07-0022]
- EUDP [64009-0050]
- Danish National Research Foundation
- European Commission [248678, 261936, 288565]
- EUIndian framework of the Largecells project
- PVERA-NET
- CONACYT (Mexico)
- Spanish Ministry of Science and Innovation, MICINN-FEDER [ENE2008-04373]
- Consolider NANOSELECT [CSD2007-00041]
- Xarxa de Referencia en Materials Avancats per a l'Energia, XaRMAE of the Catalonia Government (Spain)
- Thuringian Ministry of Culture
- German Federal Ministry of Education and Research [13N9843]
- Inger and Jens Bruun Foundation through The American-Scandinavian Foundation
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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 RISempty set-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 (N-2) 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.
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