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Issue 9, 2019
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Perylene diimide-based cathode interfacial materials: adjustable molecular structures and conformation, optimized film morphology, and much improved performance of non-fullerene polymer solar cells

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Abstract

Non-fullerene polymer solar cells (PSCs) have earned widespread attention on account of their distinct advantages, such as low-cost solution processability, tunable energy levels and suitability for large-scale production. Herein, a series of perylene diimide (PDI) derivatives with different sizes of side and terminal groups are developed and used as cathode interfacial layers (CILs) for conventional non-fullerene polymer solar cells. The regulation of molecular structures can change the film morphology and improve the device performance. Taking PDI-NBr without a side group as the reference, the device modified with P3P-NBr bearing m-terphenyl as the side group shows much increased power conversion efficiency (PCE) by 46% (7.14% versus 10.46%). Moreover, once the terminal group changes to amino N-oxide (NO), PSC based on P1P-NO with a suitable side group displays the champion PCE of 11.56% and much improved stability, providing a new method to optimize the interfacial materials for non-fullerene PSCs.

Graphical abstract: Perylene diimide-based cathode interfacial materials: adjustable molecular structures and conformation, optimized film morphology, and much improved performance of non-fullerene polymer solar cells

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Publication details

The article was received on 12 Apr 2019, accepted on 03 Jul 2019 and first published on 04 Jul 2019


Article type: Research Article
DOI: 10.1039/C9QM00236G
Mater. Chem. Front., 2019,3, 1840-1848

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    Perylene diimide-based cathode interfacial materials: adjustable molecular structures and conformation, optimized film morphology, and much improved performance of non-fullerene polymer solar cells

    Y. Li, M. Han, W. Yang, J. Guo, K. Chang, J. Wang, J. Min, Q. Li and Z. Li, Mater. Chem. Front., 2019, 3, 1840
    DOI: 10.1039/C9QM00236G

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