Flexible-spacer incorporated polymer donors enable superior blend miscibility for high-performance and mechanically-robust polymer solar cells,Energy & Environmental Science

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Flexible-spacer incorporated polymer donors enable superior blend miscibility for high-performance and mechanically-robust polymer solar cells
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-5-11 , DOI: 10.1039/d1ee01062j
Jin-Woo Lee _{1,

2,

3,

4} , Dahyun Jeong _{1,

2,

3,

4} , Dong Jun Kim _{2,

3,

4,

5} , Tan Ngoc-Lan Phan _{1,

2,

3,

4} , Jin Su Park _{1,

2,

3,

4} , Taek-Soo Kim _{2,

3,

4,

5} , Bumjoon J. Kim _{1,

2,

3,

4}

Affiliation

Developing polymer solar cells (PSCs) with high photovoltaic performance and mechanical robustness is one of the most urgent tasks to ensure their operational reliability and applicability in wearable devices. However, it remains challenging to enhance their mechanical properties without compromising the electrical properties of high-performance active materials. Here, we develop a series of novel polymer donors (P_Ds), with which highly efficient PSCs having remarkable mechanical reliability are demonstrated. By interposing a controlled amount of 1,10-di(thiophen-2-yl)decane flexible spacer (FS) into a PM6 backbone, we are able to significantly enhance the intermixing of the new P_Ds with a small molecule acceptor (Y7), affording sufficient pathways for efficient charge percolation and mechanical stress dissipation. As a result, PSCs based on the P_D containing 5 mol% FS units and Y7 exhibit a high power conversion efficiency (PCE) of 17% with a crack onset strain (COS) of 12% and a cohesive fracture energy (G_c) of 2.1 J m⁻², significantly outperforming reference PM6-based devices (PCE = 15%, COS = 2% and G_c = 1.0 J m⁻²). Both the photovoltaic performance and mechanical robustness of these PSCs are among the best values reported to date. The rational design of the P_Ds demonstrated here presents a highly promising strategy to address the mechanical properties of SMA-based solar cells and their viable application in flexible/stretchable electronics.

中文翻译：

掺入柔性间隔物的聚合物供体可为高性能和机械坚固的聚合物太阳能电池提供卓越的共混混溶性

开发具有高光伏性能和机械强度的聚合物太阳能电池 (PSC) 是确保其在可穿戴设备中的运行可靠性和适用性的最紧迫任务之一。然而，在不影响高性能活性材料的电性能的情况下提高其机械性能仍然具有挑战性。在这里，我们开发了一系列新型聚合物供体（P _D s），证明了具有显着机械可靠性的高效 PSC。通过将受控量的 1,10-二(噻吩-2-基)癸烷柔性间隔物 (FS) 插入 PM6 骨架中，我们能够显着增强新P _D的混合s 带有小分子受体 (Y7)，为有效的电荷渗透和机械应力耗散提供了足够的途径。因此，基于含有 5 mol% FS 单元和 Y7的P _{D 的}PSC表现出 17% 的高功率转换效率 (PCE)、12% 的裂纹起始应变 (COS) 和内聚断裂能 ( G _c ) 2.1 J m ^-2，显着优于基于 PM6 的参考设备（PCE = 15%，COS = 2% 和G _c = 1.0 J m ^-2）。这些 PSC 的光伏性能和机械强度都是迄今为止报道的最佳值之一。P _D的合理设计这里展示的 s 提出了一种非常有前途的策略来解决基于 SMA 的太阳能电池的机械性能及其在柔性/可拉伸电子产品中的可行应用。

更新日期：2021-06-08

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