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J Am Chem Soc. 2018 Jul 18;140(28):8934-8943. doi: 10.1021/jacs.8b05038. Epub 2018 Jul 9.

Morphology Optimization via Side Chain Engineering Enables All-Polymer Solar Cells with Excellent Fill Factor and Stability.

Author information

1
Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices , South China University of Technology , Guangzhou 510640 , People's Republic of China.
2
Center for Polymers and Organic Solids , University of California , Santa Barbara , California 93106 , United States.
3
Institute of Materials for Electronics and Energy Technology (i-MEET) , Friedrich-Alexander-Universität Erlangen-Nürnberg , Martensstrasse 7 , 91058 Erlangen , Germany.
4
Molecular Materials and Nanosystems, Institute for Complex Molecular Systems , Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven , The Netherlands.
5
Department of Physics and Astronomy , Shanghai Jiao Tong University , Shanghai 200240 , People's Republic of China.
6
Bavarian Center for Applied Energy Research (ZAE Bayern) , Immerwahrstrasse 2 , 91058 Erlangen , Germany.

Abstract

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 NOE x, 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 °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.

PMID:
29944354
DOI:
10.1021/jacs.8b05038

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