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Sequentially regular polymer acceptors featuring flexible spacers for high-performance and mechanically robust all-polymer solar cells
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2022-09-16 , DOI: 10.1039/d2ee02523j
Jin-Woo Lee, Cheng Sun, Sun-Woo Lee, Geon-U. Kim, Sheng Li, Cheng Wang, Taek-Soo Kim, Yun-Hi Kim, Bumjoon J. Kim

Developing high-performance and mechanically robust polymer solar cells (PSCs) is crucial for realizing wearable power sources. While efficient all-polymer solar cells (all-PSCs) can be fabricated from polymerized small-molecule acceptors (PSMAs) with high optical absorption and electron mobilities, they still show limited mechanical robustness. Here, we achieve highly efficient and mechanically robust all-PSCs by designing a PSMA (PYFS-Reg) containing sequence-regular flexible spacers (FSs). The regular incorporation of the FS units into PSMAs is essential in simultaneously improving the electrical and mechanical properties of blend films. As a result, all-PSCs featuring PYFS-Reg achieve a high power conversion efficiency (PCE = 16.1%) and stretchability (crack onset strain (COS) = 22.4%), outperforming PSMAs without FSs (i.e., PYBDT, PCE = 12.6% and COS = 11.7%) or with randomly distributed FSs (i.e., PYFS-Ran, PCE = 12.2% and COS = 18.1%). Importantly, these all-PSCs are fabricated by an environmentally benign, non-halogenated solvent process. To further demonstrate their feasible applications in wearable devices, we construct intrinsically stretchable (IS) all-PSCs by using PYFS-Reg-based active layers, which exhibit a high PCE (10.6%) and excellent device stretchability (strain at PCE80% = 36.7%).

中文翻译:

具有柔性垫片的顺序规则聚合物受体,用于高性能和机械坚固的全聚合物太阳能电池

开发高性能和机械坚固的聚合物太阳能电池 (PSC) 对于实现可穿戴电源至关重要。虽然高效的全聚合物太阳能电池 (all-PSC) 可以由具有高光吸收和电子迁移率的聚合小分子受体 (PSMA) 制造,但它们的机械强度仍然有限​​。在这里,我们通过设计包含序列规则柔性间隔(FS)的 PSMA(PYFS-Reg)来实现高效且机械稳健的全 PSC。将 FS 单元定期结合到 PSMA 中对于同时改善共混膜的电气和机械性能至关重要。因此,具有 PYFS-Reg 的全 PSC 实现了高功率转换效率(PCE = 16.1%)和可拉伸性(裂纹起始应变 (COS) = 22.4%),优于没有 FS 的 PSMA(,PYBDT,PCE = 12.6% 和 COS = 11.7%)或随机分布的 FS(,PYFS-Ran,PCE = 12.2% 和 COS = 18.1%)。重要的是,这些全 PSC 是通过对环境无害的非卤化溶剂工艺制造的。为了进一步证明它们在可穿戴设备中的可行性应用,我们通过使用基于 PYFS-Reg 的活性层构建了本征可拉伸 (IS) 全 PSC,其表现出高 PCE (10.6%) 和出色的设备拉伸性 (PCE 应变80% = 36.7%)。
更新日期:2022-09-16
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