1. Efficient Polymer Solar Cells Based on Non-fullerene Acceptors with Potential Device Lifetime Approaching 10 Years 
Xiaoyan Du, Thomas Heumueller, Wolfgang Gruber, Andrej Classen, Tobias Unruh, Ning Li, Christoph J. Brabec 
Joule 
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3. Figure 1
The Chemical Structure of Donor and Acceptor Materials Used in This Work
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4. Figure 2
The Device Stability under Continuous Illumination in a Dry Nitrogen Atmosphere
(A–D) JSC (A), VOC (B), FF (C), and PCE (D). Device parameters are averaged over six devices with an error bar shown in each plot.
(E and F) Current voltage curves of representative devices based on (E) ITIC-2F and (F) ITIC-DM under continuous LED illumination. Current density is normalized to the initial value.
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5. Figure 3 Charge Carrier Lifetime and Recombination Order
(A and B) Charge carrier lifetime versus charge carrier density for (A) fresh and (B) aged organic solar cells based on different acceptors. The recombination orders are shown in the insets.
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6. Figure 4
The Photo-CELIV of Fresh and Aged Organic Solar Cells Based on Different Acceptors
(A–F) PCBM (A), ITIC (B), ITIC-2F (C), ITIC-M (D), ITIC-DM (E), and ITIC-Th (F).
Delay time is 1 μs for PCBM-based devices and 10 μs for all other devices.
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7. Figure 5
Analysis of BHJ Morphology of Fresh and Aged Blend Films (under 1 Sun Equivalent Illumination for 500 hr in N2 Atmosphere)
(A and B) Grazing incidence wide-angle X-ray scattering line cuts of fresh and aged blend films based on different acceptors. (A) In-plane (IP) direction and (B) out-of-plane (OOP) direction.
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