Layer-by-Layer Processed PM6:Y6-Based Stable Ternary Polymer Solar Cells with Improved Efficiency over 18% by Incorporating an Asymmetric Thieno[3,2-b]indole-Based Acceptor,Advanced Functional Materials

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Layer-by-Layer Processed PM6:Y6-Based Stable Ternary Polymer Solar Cells with Improved Efficiency over 18% by Incorporating an Asymmetric Thieno[3,2-b]indole-Based Acceptor
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-03-16 , DOI: 10.1002/adfm.202200629
Jinglong Chen ₁ , Jiamin Cao ₂ , Longfei Liu ₁ , Liang Xie ₂ , Hu Zhou ₂ , Jianqi Zhang ₃ , Kai Zhang ₄ , Manjun Xiao ₁ , Fei Huang ₄

Affiliation

Although much research on device engineering have brought about significant improvements in PM6:Y6-based polymer solar cell (PSCs) performance, there is still a lack of relevant research to solve the problems caused by the over-aggregation of Y6 and the long-term stability of the device morphology. Herein, a newly designed and synthesized low-bandgap asymmetric small molecule acceptor TIT-2Cl based on thieno[3,2-b]indole core is elaborately introduced into PM6:Y6-based PSCs to suppress the over-aggregation of Y6 molecules with significantly increased efficiency from 15.78% to 17.00%. Moreover, the addition of TIT-2Cl contributes to improved light harvesting, the lowest unoccupied molecular orbital level of Y6:TIT-2Cl, charge separation, transport, and extraction. Simultaneously, the PSCs are further prepared by using the progressive spin-coating method of layer-by-layer (LBL). Due to the formation of vertical phase distribution and the improvement of carrier transport performance, the champion efficiency of LBL-type ternary PSCs reaches 18.18%, which is the highest efficiency reported for PM6:Y6-based PSCs, along with superior stability and compositional insensitivity. Therefore, the results show that the combination of ternary strategy by incorporating appropriate asymmetric molecules and the LBL method is an effective means to fabricate highly efficient stable PSCs.

中文翻译：

通过引入不对称的噻吩并[3,2-b]吲哚受体，逐层处理的基于 PM6:Y6 的稳定三元聚合物太阳能电池的效率提高了 18% 以上

尽管器件工程方面的大量研究已经为 PM6:Y6 基聚合物太阳能电池（PSCs）性能带来了显着的改善，但对于解决 Y6 过度聚集和长期器件形态的稳定性。在此，新设计合成了一种基于噻吩并[3,2- b ]的低带隙不对称小分子受体TIT-2Cl] 吲哚核被精心引入基于 PM6:Y6 的 PSC 中，以抑制 Y6 分子的过度聚集，效率从 15.78% 显着提高到 17.00%。此外，添加 TIT-2Cl 有助于改善光捕获、Y6:TIT-2Cl 的最低未占分子轨道水平、电荷分离、传输和提取。同时，使用逐层（LBL）的渐进旋涂方法进一步制备PSC。由于垂直相分布的形成和载流子传输性能的提高，LBL 型三元 PSCs 的冠军效率达到了 18.18%，这是 PM6:Y6 基 PSCs 报道的最高效率，同时具有优异的稳定性和成分不敏感性. 所以，

更新日期：2022-03-16

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