Achieving 15.81% and 15.29% efficiency of all-polymer solar cells based on layer-by-layer and bulk heterojunction structures,Journal of Materials Chemistry A

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Achieving 15.81% and 15.29% efficiency of all-polymer solar cells based on layer-by-layer and bulk heterojunction structures
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-06-06 , DOI: 10.1039/d2ta02914f
Wenjing Xu ₁ , Xixiang Zhu ₁ , Xiaoling Ma ₁ , Hang Zhou ₂ , Xiong Li ₃ , Sang Young Jeong ₄ , Han Young Woo ₄ , Zhengji Zhou ₅ , Qianqian Sun ₂ , Fujun Zhang ₁

Affiliation

Wide bandgap polymer donor PM6 and narrow bandgap polymer acceptor PY-IT were selected to construct all-polymer solar cells (all-PSCs) with a layer-by-layer (LbL) or bulk heterojunction (BHJ) structure. The solvent additive 1-chloronaphthalene (CN) plays a vital role in improving the performance of all-PSCs. The power conversion efficiency (PCE) of LbL all-PSCs is improved to 15.81% from 13.67% by incorporating 1 vol% CN in PY-IT solution, benefiting from the simultaneously enhanced short circuit current density (J_SC) of 22.61 mA cm⁻² and fill factor (FF) of 73.62%. A similar phenomenon is also observed in BHJ all-PSCs whose PCE increased from 13.29% to 15.29% by incorporating 1 vol% CN in PM6:PY-IT blend solution, originating from the optimized phase separation for better exciton dissociation and charge transport in the BHJ active layers. Over 15% PCE improvement can be obtained in the BHJ and LbL all-PSCs by incorporating appropriate additive CN as a morphology regulator. It should be noticed that the PCEs of LbL all-PSCs with CN are higher than those of other all-PSCs, indicating that the LbL processing method combined with the additive should be a prospective strategy to fabricate highly efficient all-PSCs.

中文翻译：

基于逐层和本体异质结结构的全聚合物太阳能电池效率分别为 15.81% 和 15.29%

选择宽带隙聚合物供体 PM6 和窄带隙聚合物受体 PY-IT 来构建具有逐层 (LbL) 或体异质结 (BHJ) 结构的全聚合物太阳能电池 (all-PSC)。溶剂添加剂 1-氯萘 (CN) 在提高全 PSC 的性能方面起着至关重要的作用。通过在 PY-IT 解决方案中加入 1 vol% CN，LbL 全 PSC 的功率转换效率 (PCE) 从 13.67% 提高到 15.81%，这得益于同时增强的 22.61 mA cm-短路电流密度 ( J _{SC )}^{- 2}填充因子 (FF) 为 73.62%。在 BHJ 全 PSC 中也观察到类似现象，通过在 PM6:PY-IT 混合溶液中加入 1 vol% CN，PCE 从 13.29% 增加到 15.29%，这源于优化的相分离，以实现更好的激子离解和电荷传输。 BHJ 活动层。通过加入适当的添加剂 CN 作为形态调节剂，可以在 BHJ 和 LbL 全 PSC 中获得超过 15% 的 PCE 改进。值得注意的是，含 CN 的 LbL 全 PSC 的 PCE 高于其他全 PSC，这表明与添加剂相结合的 LbL 加工方法应该是制备高效全 PSC 的一种前瞻性策略。

更新日期：2022-06-06

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