Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 25, Pages 11884-11889Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta03112f
Keywords
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Funding
- National Basic Research Program of China [2015CB932200]
- Natural Science Foundation of Jiangsu [BK20140952, BK20150043]
- National Natural Science Foundation of China [11474164, 61405091, 61634001]
- European Union [2016YFE0112000]
- Synergetic Innovation Center for Organic Electronics and Information Displays
- National High Technology Research and Development Program of China [2011AA050520]
- Jiangsu Specially-Appointed Professor program, Chinese Scholarship Council (CSC)
- Swedish Research Council (VR)
- European Commission SOLAR-ERA-NET
- Swedish Energy Agency (Energimyndigheten)
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]
- Knut and Alice Wallenberg foundation (KAW)
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The stability of organic solar cells (OSCs) is critical for practical applications of this emerging technology. Unfortunately, in spite of intensive investigations, the degradation mechanisms in OSCs have not been clearly understood yet. In this report, we employ a range of spectroscopic and transport measurements, coupled with drift-diffusion modelling, to investigate the light-induced degradation mechanisms of fullerene-based OSCs. We find that trap states formed in the fullerene phase under illumination play a critical role in the degradation of the open-circuit voltage (V-OC) in OSCs. Our results indicate that the degradation is intrinsic to the fullerenes in OSCs and that alternative acceptor materials are desired for the development of stable OSCs.
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