In situ and ex situ investigations on ternary strategy and co-solvent effects towards high-efficiency organic solar cells,Energy & Environmental Science

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In situ and ex situ investigations on ternary strategy and co-solvent effects towards high-efficiency organic solar cells
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-04-21 , DOI: 10.1039/d2ee00740a
Ruijie Ma ₁ , Cenqi Yan ₂ , Patrick Wai-Keung Fong ₂ , Jiangsheng Yu ₂ , Heng Liu ₃ , Junli Yin ₁ , Jianhua Huang ₄ , Xinhui Lu ₃ , He Yan _{1,

5} , Gang Li ₂

Affiliation

The morphology of organic solar cells (OSCs) is a core topic for achieving the ultimate photovoltaic performance. Herein, we focused on the combination of two important morphology regulation strategies, i.e., ternary strategy and cosolvent engineering. Using an amorphous polymer acceptor, BN-T, as the third component, the PM6:BTP-eC11 and PM6:eC9 host binary systems, treated by the o-xylene and 1-phenylnaphthalene solvent system and chlorobenzene and 1,8-diiodooctane solvent system, respectively, both realized an effective improvement in the power conversion efficiencies (PCEs). However, the ex situ morphological characterization revealed that these two systems undergo different types of changes in phase segregation and molecular packing, which cannot be understood by the current popular miscibility analysis. In this work, an in situ investigation was carried out during the spin casting and thermal annealing processes. The time-resolved reflection spectroscopy technique showed that BN-T retained more PN in the ternary films during the casting process, thereby facilitating the aggregation of eC11 and enlarging its domain size. In contrast, the incorporation of BN-T did not affect the DIO content in the films, resulting in a less separated morphology for the eC9-based systems, as predicted by the miscibility study. In addition to state-of-the-art PCEs, this work provides an insightful understanding of the morphology evolution in ternary OSCs assisted by a high-boiling solvent additive via in situ investigation techniques.

中文翻译：

三元策略和共溶剂效应对高效有机太阳能电池的原位和异位研究

有机太阳能电池 (OSC) 的形态是实现最终光伏性能的核心课题。在此，我们重点研究了两种重要的形态调控策略的结合，即三元策略和助溶剂工程。使用无定形聚合物受体 BN-T 作为第三组分，PM6:BTP-eC11 和 PM6:eC9 主体二元系统，用邻二甲苯和 1-苯基萘溶剂系统以及氯苯和 1,8-二碘辛烷溶剂处理系统分别实现了功率转换效率（PCE）的有效提高。然而，异地形态学表征表明，这两个体系在相分离和分子堆积方面经历了不同类型的变化，这是目前流行的混溶性分析无法理解的。在这项工作中，原位在旋转铸造和热退火过程中进行了调查。时间分辨反射光谱技术表明，BN-T在流延过程中在三元薄膜中保留了更多的PN，从而促进了eC11的聚集并扩大了其域尺寸。相比之下，BN-T 的掺入不影响薄膜中的 DIO 含量，导致基于 eC9 的系统的分离形态较少，正如混溶性研究所预测的那样。除了最先进的 PCE 之外，这项工作还通过原位研究技术提供了对高沸点溶剂添加剂辅助下三元 OSC 形态演变的深刻理解。

更新日期：2022-04-21

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