Journal
ORGANIC ELECTRONICS
Volume 15, Issue 1, Pages 47-56Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2013.10.017
Keywords
Organic photovoltaics; Stability; Degradation; Extraction layer; Buffer layer; Interfacial
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC Alexander Graham Bell Canada Graduate Scholarship
- Ontario Graduate Scholarship
- WIN Nanofellowship
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Organic solar cells (OSCs) are studied for their photo-stability in inert atmosphere. Polymer solar cells with a bulk heterojunction (BHJ) of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) are contrasted with small molecule solar cells with a BHJ of chloroindium phthalocyanine (ClInPc) and C-60-fullerene. A series of charge extraction layers at the hole and electron collecting contacts are examined for their role in OSC performance and stability. The inter-compatibilities of these extraction layers in vacuum-deposited small molecule OSCs (SM-OSCs) versus solution-coated polymer OSCs (P-OSCs) are explored. Through photo-stability studies, we show that interfacial extraction layers are necessary to avoid contact photo-degradation, which otherwise leads to strong reductions in OSC efficiencies. We also highlight certain extraction layer combinations that result in strong inter-electrode degradation, and we discuss incompatibilities in extraction layers among SM-OSCs versus P-OSCs. Our results suggest that the presence of excitons at the organic-electrode interface likely plays a critical role in contact photo-degradation. By minimizing contact photo-degradation, which dominates the majority of short-term OSC degradation, a new avenue for studying OSC stability behavior and opportunities to focus on other losses in OSCs become possible. (C) 2013 Elsevier B.V. All rights reserved.
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