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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >A random donor polymer based on an asymmetric building block to tune the morphology of non-fullerene organic solar cells
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A random donor polymer based on an asymmetric building block to tune the morphology of non-fullerene organic solar cells

机译：基于非对称结构块的随机供体聚合物调整非富烯有机太阳能电池的形态

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摘要

Non-fullerene organic solar cells (NF-OSCs) require donor polymers with different morphological properties from those used in fullerene devices to achieve optimal cell performance. In this paper, we report a random donor polymer (PTFB-M) constructed from an asymmetric donor unit (T-FB-T-M), which can effectively tune the morphology and thus enhance the performance of NF-OSCs. Compared with its analog polymer PTFB-P based on a C2 symmetric monomer, the asymmetric T-FB-T-M unit introduces some randomness in the PTFB-M polymer yielding several beneficial effects. Firstly, although the neat PTFB-M film exhibits slightly reduced crystallinity and hole mobility compared to PTFB-P, it can, to our surprise, better maintain its crystallinity when blended with non-fullerene acceptors, hence yielding NF-OSCs with higher hole mobility and fill factors (FF) compared to devices based on PTFB-P. In addition, PTFB-M also exhibits smaller and more favorable domain sizes in NF-OSCs, leading to higher external quantum efficiency (EQE) and short circuit current density (J(sc)). As a result, when combined with a small molecule acceptor (SMA) ITIC-Th, PTFB-M yields a power conversion efficiency (PCE) of 10.4%, whereas the PCE is only 8.4% for PTFB-P:ITIC-Th-based cells. This provides a useful approach to tune the morphology of donor polymers and to enhance the performance of NF-OSCs.
机译：非富勒烯有机太阳能电池（NF-OSCs）需要具有不同形态学性质的供体聚合物，其中来自富勒烯装置的那些，以实现最佳的细胞性能。在本文中，我们报告了由不对称供体单元（T-FB-T-M）构成的随机供体聚合物（PTFB-M），这可以有效地调整形态，从而提高NF-OSC的性能。与基于C2对称单体的模拟聚合物PTFB-P相比，不对称T-FB-T-M单元在PTFB-M聚合物中引入了一些随机性，从而产生几种有益效果。首先，与PTFB-P相比，纯净的PTFB-M膜表现出略微降低的结晶度和空穴迁移率，它可以令我们意外地保持与非富含环受体混合时的结晶度，因此产生具有更高孔移动性的NF-OSC与基于PTFB-P的器件相比，填充因子（FF）。此外，PTFB-M还在NF-OSC中表现出较小且更有利的域尺寸，导致外部量子效率（EQE）和短路电流密度（J（SC））更高。结果，当与小分子受体（SMA）合并ITIC-TH时，PTFB-M产生10.4％的功率转换效率（PCE），而PCE仅为PTFB-P-P：基于ITIC-TH的8.4％细胞。这提供了一种有用的方法来调整供体聚合物的形态并增强NF-OSCs的性能。

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    Liu Jing; Ma Lik-Kuen; Li Zhengke; Hu Huawei; Ma Tingxuan; Zhu Chenhui; Ade Harald; Yan He;

  • 作者单位

    Hong Kong Univ Sci &

    Technol Chinese Natl Engn Res Ctr Tissue Restorat &

    Recon Hong Kong Branch Dept Chem Kowloon Hong Kong Peoples R China;

    Hong Kong Univ Sci &

    Technol Chinese Natl Engn Res Ctr Tissue Restorat &

    Recon Hong Kong Branch Dept Chem Kowloon Hong Kong Peoples R China;

    Hong Kong Univ Sci &

    Technol Chinese Natl Engn Res Ctr Tissue Restorat &

    Recon Hong Kong Branch Dept Chem Kowloon Hong Kong Peoples R China;

    Hong Kong Univ Sci &

    Technol Chinese Natl Engn Res Ctr Tissue Restorat &

    Recon Hong Kong Branch Dept Chem Kowloon Hong Kong Peoples R China;

    Hong Kong Univ Sci &

    Technol Chinese Natl Engn Res Ctr Tissue Restorat &

    Recon Hong Kong Branch Dept Chem Kowloon Hong Kong Peoples R China;

    Lawrence Berkeley Natl Lab Adv Light Source Berkeley CA 94720 USA;

    North Carolina State Univ Dept Phys Raleigh NC 27695 USA;

    Hong Kong Univ Sci &

    Technol Chinese Natl Engn Res Ctr Tissue Restorat &

    Recon Hong Kong Branch Dept Chem Kowloon Hong Kong Peoples R China;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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