Flexible Spacer Units Enhance 3D Terpolymer Acceptors’ Optoelectronic Performance in Rigid and Flexible Devices

IF 5.1 1区化学 Q1 POLYMER SCIENCE

Macromolecules Pub Date : 2025-03-09 DOI:10.1021/acs.macromol.4c02814

Xiaoping Wang, Yu Fang, Bin Huang, Yaru Yue, Mingming Que, Ai Lan, Sang Young Jeong, Kunming Liu, Jin-Biao Liu, Liqing Li, Han Young Woo, Shanshan Chen

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引用次数: 0

Abstract

Designing high-performance, mechanically stable, all-polymer solar cells (all-PSCs) is crucial for their effective use in flexible and stretchable electronic devices. In this work, we developed three-dimensional polymer acceptors H6, H7, and H8 by introducing a nonconjugated flexible alkyl chain strategy to achieve efficiency and mechanical robustness in all-PSCs. Thanks to an appropriate amount of flexible space unit [flexible spacer (FS)] incorporation, improved solubility, and suppression of the excessive aggregation of the blend film, the PM:H7 device based on 5% FS acquired a remarkable 16.25% power conversion efficiency (PCE), higher than the PM6:H6 device (PCE = 15.10%) without FS units and the PM6:H8 device (PCE = 16.17%) with 10% FS units. Furthermore, we fabricated the intrinsically stretchable all-PSCs to evaluate the device’s mechanical stability and ductility. As a consequence, the H7-based all-PSCs exhibited an encouraging PCE up to 15.22% and excellent mechanical stretchability with a crack-onset strain = 12.31%. Our findings suggest that incorporating FS is an effective strategy for enhancing the mechanical robustness of conjugated polymer films, highlighting significant potential for applications in wearable devices.

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设计高性能、机械稳定的全聚合物太阳能电池（all-PSCs）对其在柔性和可拉伸电子设备中的有效应用至关重要。在这项工作中，我们通过引入非共轭柔性烷基链策略，开发了三维聚合物受体 H6、H7 和 H8，以实现全聚合物太阳能电池的效率和机械稳定性。由于加入了适量的柔性空间单元[柔性间隔物 (FS)]、提高了溶解性并抑制了共混薄膜的过度聚集，基于 5% FS 的 PM:H7 器件获得了 16.25% 的显著功率转换效率 (PCE)，高于不含 FS 单元的 PM6:H6 器件（PCE = 15.10%）和含 10% FS 单元的 PM6:H8 器件（PCE = 16.17%）。此外，我们还制造了本征可拉伸全多晶硅，以评估器件的机械稳定性和延展性。结果表明，基于 H7 的全-PSC 具有令人鼓舞的高达 15.22% 的 PCE 和出色的机械拉伸性（裂纹发生应变 = 12.31%）。我们的研究结果表明，加入 FS 是增强共轭聚合物薄膜机械稳健性的有效策略，在可穿戴设备中的应用潜力巨大。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.