High‐Performance Non‐Fullerene Polymer Solar Cells Based on a Pair of Donor–Acceptor Materials with Complementary Absorption Properties

Lin, Haoran; Chen, Shangshang; Li, Zhengke; Lai, Joshua Yuk Lin; Yang, Guofang; McAfee, Terry; Jiang, Kui; Li, Yunke; Liu, Yuhang; Hu, Huawei; Zhao, Jingbo; Ma, Wei; Ade, Harald; Yan, He

doi:10.1002/adma.201502775

Cited by 233 publications

(155 citation statements)

References 52 publications

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“…PffBT4T-2DT is less crystalline and yields lower hole mobility than PffBT4T-2OD, yet it performs better with SMAs (refs 9, 48). Another similar example was also observed for a triazole-based polymer family, in which the polymer with longer alkyl chains matches better with non-fullerene acceptors4950.…”

Section: Discussionsupporting

confidence: 64%

Donor polymer design enables efficient non-fullerene organic solar cells

et al. 2016

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To achieve efficient organic solar cells, the design of suitable donor–acceptor couples is crucially important. State-of-the-art donor polymers used in fullerene cells may not perform well when they are combined with non-fullerene acceptors, thus new donor polymers need to be developed. Here we report non-fullerene organic solar cells with efficiencies up to 10.9%, enabled by a novel donor polymer that exhibits strong temperature-dependent aggregation but with intentionally reduced polymer crystallinity due to the introduction of a less symmetric monomer unit. Our comparative study shows that an analogue polymer with a C2 symmetric monomer unit yields highly crystalline polymer films but less efficient non-fullerene cells. Based on a monomer with a mirror symmetry, our best donor polymer exhibits reduced crystallinity, yet such a polymer matches better with small molecular acceptors. This study provides important insights to the design of donor polymers for non-fullerene organic solar cells.

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Section: Discussionsupporting

confidence: 64%

Donor polymer design enables efficient non-fullerene organic solar cells

et al. 2016

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“…In these systems, another interesting feature is the easy energy level matching to get higher V oc with lower E loss of 0.6–0.7 eV (refs 21, 25, 26, 38). For example, the non-fullerene PSCs based on a medium bandgap D-A copolymer PffT2-FTAZ-2DT as donor and a low bandgap n-OS IEIC (ref.…”

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11.4% Efficiency non-fullerene polymer solar cells with trialkylsilyl substituted 2D-conjugated polymer as donor

et al. 2016

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Simutaneously high open circuit voltage and high short circuit current density is a big challenge for achieving high efficiency polymer solar cells due to the excitonic nature of organic semdonductors. Herein, we developed a trialkylsilyl substituted 2D-conjugated polymer with the highest occupied molecular orbital level down-shifted by Si–C bond interaction. The polymer solar cells obtained by pairing this polymer with a non-fullerene acceptor demonstrated a high power conversion efficiency of 11.41% with both high open circuit voltage of 0.94 V and high short circuit current density of 17.32 mA cm−2 benefitted from the complementary absorption of the donor and acceptor, and the high hole transfer efficiency from acceptor to donor although the highest occupied molecular orbital level difference between the donor and acceptor is only 0.11 eV. The results indicate that the alkylsilyl substitution is an effective way in designing high performance conjugated polymer photovoltaic materials.

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“…The optical properties and the energy levels can be fine‐tuned by structural modification. And thus there are more opportunities to group donor/acceptor pairs, to form better frontier energy level offsets and to complement light absorption 24, 25. Thus, short‐circuit current ( J sc ) and V oc can be optimized to achieve a better power conversion efficiency.…”

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High‐Performance Non‐Fullerene Organic Solar Cells Based on a Selenium‐Containing Polymer Donor and a Twisted Perylene Bisimide Acceptor

et al. 2016

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A novel polymer donor (PBDTS‐Se) is designed to match with a non‐fullerene acceptor (SdiPBI‐S). The corresponding solar cells show a high efficiency of 8.22%, which result from synergetic improvements of light harvesting, charge carrier transport and collection, and morphology. The results indicate that rational design of novel donor materials is important for non‐fullerene organic solar cells.

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High‐Performance Non‐Fullerene Polymer Solar Cells Based on a Pair of Donor–Acceptor Materials with Complementary Absorption Properties

Cited by 233 publications

References 52 publications

Donor polymer design enables efficient non-fullerene organic solar cells

Donor polymer design enables efficient non-fullerene organic solar cells

11.4% Efficiency non-fullerene polymer solar cells with trialkylsilyl substituted 2D-conjugated polymer as donor

High‐Performance Non‐Fullerene Organic Solar Cells Based on a Selenium‐Containing Polymer Donor and a Twisted Perylene Bisimide Acceptor

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