浙江师范大学李永舫团队通过溶剂-固体混合添加剂同时优化分子堆积和相分离，使有机太阳能电池的效率超过19% 。相关研究成果成果发表在2024年9月24日出版的《中国化学》。

鉴于薄膜形态在决定有机太阳能电池（OSCs）光伏参数中的关键作用，溶剂或固体添加剂已被广泛用于实现精细调节的薄膜形态特征，以进一步提高OSCs的性能。然而，大多数高性能OSCs仅使用单组分添加剂（溶剂添加剂或固体添加剂）进行加工。

该文中，一种简单的分子结构单元，即噻吩并[3,4-b]噻吩（TT），被用作固体添加剂，与广泛使用的溶剂添加剂1-氯萘（CN）配位，以调节薄膜形态。

系统研究表明，添加TT可以防止过度聚集形成精细的纳米级相分离，从而增强电荷传输并抑制电荷复合，以及优异的光伏性能。因此，添加CN+TT混合添加剂的PM6:Y6基OSCs的最佳PCE为18.52%，FF为79.6%。更令人印象深刻的是，用混合添加剂处理的PM6:Y6:PC71BM基三元OSCs的效率高达19.05%，是迄今为止报道的Y6基OSCs的最佳值之一。

该项工作强调了混合添加剂策略，在调节活性层形态以显著提高性能方面的重要性。

附：英文原文

Title: Simultaneously Optimizing Molecular Stacking and Phase Separation via Solvent-Solid Hybrid Additives Enables Organic Solar Cells with over 19% Efficiency†

Author: Haicui Liu, Keli Shi, Jing Lai, Seonghun Jeong, Can Zhu, Jinyuan Zhang, Zhi-Guo Zhang, Changduk Yang, Beibei Qiu, Yongfang Li

Issue&Volume: 2024-09-24

Abstract: Given the crucial role of film morphology in determining the photovoltaic parameters of organic solar cells (OSCs), solvent or solid additives have been widely used to realize fine-tuned film morphological features to further improve the performance of OSCs. However, most high-performance OSCs are processed only using single component additive, either solvent additive or solid additive. Herein, a simple molecular building block, namely thieno[3,4-b]thiophene (TT), was utilized as the solid additive to coordinate with the widely used solvent additive, 1-chloronaphthalene (CN), to modulate the film morphology. Systematical investigations revealed that the addition of TT could prevent the excessive aggregation to form a delicate nanoscale phase separation, leading to enhanced charge transport and suppressed charge recombination, as well as superior photovoltaic performance. Consequently, the PM6:Y6 based OSCs with the addition of hybrid additive of CN + TT demonstrated the optimal PCE of 18.52%, with a notable FF of 79.6%. More impressively, the PM6:Y6:PC71BM based ternary OSCs treated with the hybrid additives delivered a remarkable efficiency of 19.05%, which ranks among the best values of Y6-based OSCs reported so far. This work highlights the importance of the hybrid additive strategy in regulating the active layer morphology towards significantly improved performance.

DOI: 10.1002/cjoc.202400685

Source: https://onlinelibrary.wiley.com/doi/full/10.1002/cjoc.202400685