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  DOI: 10.1016/j.joule.2018.09.001 Copyright © 2018 Elsevier Inc. Terms and Conditions

Joule DOI: (10.1016/j.joule.2018.09.001) Copyright © 2018 Elsevier Inc. Terms and Conditions

Figure 1 The Chemical Structure of Donor and Acceptor Materials Used in This Work Joule DOI: (10.1016/j.joule.2018.09.001) Copyright © 2018 Elsevier Inc. Terms and Conditions

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. Joule DOI: (10.1016/j.joule.2018.09.001) Copyright © 2018 Elsevier Inc. Terms and Conditions

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. Joule DOI: (10.1016/j.joule.2018.09.001) Copyright © 2018 Elsevier Inc. Terms and Conditions

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. Joule DOI: (10.1016/j.joule.2018.09.001) Copyright © 2018 Elsevier Inc. Terms and Conditions

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. Joule DOI: (10.1016/j.joule.2018.09.001) Copyright © 2018 Elsevier Inc. Terms and Conditions