Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 28, Pages 8934-8943Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b05038
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Funding
- Recruitment Program of Global Youth Experts of China
- Ministry of Science and Technology [2017YFA0206600, 2014CB643501]
- Natural Science Foundation of China [21634004, 21520102006, 91633301]
- DFG [BR 4031/13-1, SFB 953]
- Bavarian Ministry of Economic Affairs and Media, Energy and Technology by HI-ERN (IEK11) of FZ Julich
- Aufbruch Bayern initiative of the state of Bavaria (EnCN)
- Aufbruch Bayern initiative of the state of Bavaria (Solar Factory of the Future)
- Bavarian Initiative Solar Technologies go Hybrid (SolTech)
- China Scholarship Council (CSC)
- European Union [747422]
- European Research Council under the European Union [339031]
- Marie Curie Actions (MSCA) [747422] Funding Source: Marie Curie Actions (MSCA)
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All-polymer solar cells (all-PSCs) composed of conjugated polymers as both donor and acceptor components in bulk heterojunction photoactive layers have attracted increasing attention. However, it is a big challenge to achieve optimal morphology in polymer:polymer blends. In response, we report herein a new strategy to adjust the nanoscale organization for all-PSCs. Specifically, side chain engineering of the well-known naphthalene diimide (NDI)-based polymer N2200 is modulated by introducing a fraction of linear oligoethylene oxide (OE) side chains to replace branched alkyl chains on the NDI units and by synthesizing a series of NDI-based polymer acceptors NOEx, where x is the percentage of OE chain substituted NDI units relative to total NDI units. Compared to the reference polymer NOE0, OE-chain-containing polymer NOE10 offers a much higher power conversion efficiency (PCE) of 8.1% with a record high fill factor (FF) of 0.75 in all-PSCs. Moreover, the NOE10-based all-PSC exhibits excellent long-term and thermal stabilities with >97% of the initial PCE being maintained after 300 h of aging at 65 degrees C. This work demonstrates an effective morphology optimization strategy to achieve highly efficient and stable all-PSCs and shows the excellent potential of NOE10 as an alternative to commercially available acceptor polymers N2200.
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