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Discrepancy of optimum ratio in bulk heterojunction photovoltaic devices: Initial cell efficiency vs long-term stability

Title
Discrepancy of optimum ratio in bulk heterojunction photovoltaic devices: Initial cell efficiency vs long-term stability
Authors
Park, H.[Park, Hyun Min]Lee, K.Y.[Lee, Keel Yyong]Kim, W.[Kim, Wan Jung]Shin, H.-W.[Shin, Hee Won]Wang, D.H.[Wang, Dong Hwan]Ahn, T.K.[Ahn, Tae Kyu]Park, J.H.[Park, Jong Hyeok ]
DGIST Authors
Park, H.[Park, Hyun Min]
Issue Date
2013
Citation
ACS Applied Materials and Interfaces, 5(5), 1612-1618
Type
Article
Article Type
Article
Keywords
Bulk-HeterojunctionBulk-Heterojunction Photovoltaic DevicesConvergence of Numerical MethodsDegradationDegradation BehaviorHeterojunctionsLife-TimeMorphologyOrganic Photovoltaic DevicesOrganic Solar CellOrganic Solar CellsOxygenPhotovoltaic EffectsPoly(3-Hexylthiophene)StabilityTime-Resolved Photoluminescence
ISSN
1944-8244
Abstract
Organic photovoltaic devices are difficult to commercialize because of their vulnerability to chemical degradation related with oxygen and water and to physical degradation with aging at high temperatures. We investigated the photophysical degradation behaviors of a series of poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl C61-butyric acid methyl ester (PC60BM) bulk heterojunctions (BHJs) as a model system according to the donor-acceptor ratio. We found that the optimum P3HT:PC60BM ratio in terms of long-term stability differs from that in terms of initial cell efficiency. On the basis of cell performance decays and time-resolved photoluminescence measurements, we investigated the effects of oxygen and material self-aggregation on the stability of an organic photovoltaic device. We also observed the changes in morphological geometry and analyzed the surface elements to verify the mechanisms of degradation. © 2013 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/3284
DOI
10.1021/am302185f
Publisher
American Chemical Society
Files:
There are no files associated with this item.
Collection:
ETC1. Journal Articles


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