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π-Extended End Groups Enable High-Performance All-Polymer Solar Cells with Near-Infrared Absorption
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  • Linfeng Yu,
  • Haiqin Xiao,
  • Yu Shi,
  • Xia Guo,
  • Xinxin Xia,
  • Xinhui Lu,
  • Maojie Zhang
Linfeng Yu
Soochow University
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Haiqin Xiao
Soochow University
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Yu Shi
Soochow University
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Xia Guo
Shandong University
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Xinxin Xia
The Chinese University of Hong Kong
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Xinhui Lu
Chinese University of Hong Kong
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Maojie Zhang
Soochow University

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Narrow-bandgap n-type polymers are essential for advancing the development of all-polymer solar cells (all-PSCs). Herein, we developed a novel polymer acceptor PNT with π-extended 2-(3-oxo-2,3-dihydro-1H-cyclopenta[b]naphthalen-1-ylidene) malononitrile (CPNM) end groups. Compared to commonly used 2-(3-oxo-2,3-dihydro-1H-cyclopenta[b]naphthalen-1ylidene) malononitrile (IC) units, CPNM units have a further extended fused ring, providing the PNT polymer with extended absorption into the near-IR region (903 nm) and exhibiting a narrow optical bandgap (1.37 eV). Furthermore, PNT exhibits high electron mobility (6.79 × 10−4 cm2 V−1 S−1) and a relatively high-lying lowest unoccupied molecular orbital (LUMO) energy level of −3.80 eV. When blended with PBDB-T, all-PSC achieves a power conversion efficiency (PCE) of 13.7% and a high short-circuit current density (JSC) of 24.4 mA cm−2, mainly attributed to broad absorption (600-900 nm) and efficient charge separation and collection. Our study provides a promising polymer acceptor for all-PSCs and demonstrates that π-extended CPNM units are important to achieve high-performance for all-PSCs.
24 May 2023Reviewer(s) Assigned
25 Jun 2023Review(s) Completed, Editorial Evaluation Pending
27 Jun 2023Editorial Decision: Revise Minor
17 Jul 20231st Revision Received
18 Jul 2023Submission Checks Completed
18 Jul 2023Assigned to Editor
18 Jul 2023Review(s) Completed, Editorial Evaluation Pending
20 Jul 2023Editorial Decision: Accept