Alkoxy Substitution on Asymmetric Conjugated Molecule Enabling over 18% Efficiency in Ternary Organic Solar Cells by Reducing Nonradiative Voltage Loss,ACS Energy Letters

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Alkoxy Substitution on Asymmetric Conjugated Molecule Enabling over 18% Efficiency in Ternary Organic Solar Cells by Reducing Nonradiative Voltage Loss
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-12-06 , DOI: 10.1021/acsenergylett.2c02201
Lin Xie _{1,

2} , Ai Lan ₂ , Qun Gu ₁ , Shuncheng Yang ₁ , Wei Song ₁ , Jinfeng Ge ₁ , Rong Zhou ₁ , Zhenyu Chen ₁ , Jianqi Zhang ₃ , Xiaoli Zhang ₄ , Daobin Yang _{1,

5} , Bencan Tang _{2,

6,

7} , Tao Wu _{2,

6,

7} , Ziyi Ge _{1,

5}

Affiliation

Zhejiang Engineering Research Center for Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo315201, People’s Republic of China
Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Ningbo China, Ningbo315100, People’s Republic of China
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing100190, People’s Republic of China
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou450001, People’s Republic of China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing100049, People’s Republic of China
Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, Ningbo315100, People’s Republic of China
Key Laboratory for Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province, Department of Chemical and Environmental Engineering, The University of Nottingham Ningbo China, Ningbo315100, People’s Republic of China

A ternary strategy is considered to be an efficient and simple way to further enhance the performance of organic photovoltaics (OPVs). However, the “structure–performance” correlation of the third component in the ternary device has rarely been clearly understood from the aspect of the material’s eigenproperties. Herein, this relationship is investigated in depth by employing three asymmetric skeleton nonfullerene acceptors as the third component in the host system of PM6:BTP-eC9, respectively. Compared with TB-S and TB-S1, the alkoxy-substituted TB-S1-O possesses a more stable planar conformation, a higher surface energy, and a larger ordered stacking domain due to the existence of noncovalent conformational locking (O···H). Consequently, the PM6:BTP-eC9:TB-S1-O device exhibits the highest efficiency of 18.14% as compared with the devices based on PM6:BTP-eC9:TB-S (16.16%) and PM6:BTP-eC9:TB-S1 (16.18%). Most interestingly, only the PM6:BTP-eC9:TB-S1-O device can maintain the positive effect of V_OC improvement, because a significant reduction in nonradiative voltage loss can be observed in this device. Our systematic study reveals that alkoxy substitution on an asymmetric backbone is an efficient method to construct the third component for high-performance ternary organic solar cells.

中文翻译：

不对称共轭分子上的烷氧基取代通过减少非辐射电压损失使三元有机太阳能电池的效率超过 18%

三元策略被认为是进一步提高有机光伏（OPV）性能的有效且简单的方法。然而，三元器件中第三组分的“结构-性能”关系却很少从材料的本征性质方面得到清晰的认识。在此，通过使用三个不对称骨架非富勒烯受体分别作为 PM6:BTP-eC9 宿主系统中的第三种成分，深入研究了这种关系。与TB-S和TB-S1相比，烷氧基取代的TB-S1-O由于存在非共价构象锁定(O··· H）。因此，PM6:BTP-eC9:TB-S1-O 器件的效率最高，为 18。与基于 PM6:BTP-eC9:TB-S (16.16%) 和 PM6:BTP-eC9:TB-S1 (16.18%) 的器件相比提高了 14%。最有趣的是，只有 PM6:BTP-eC9:TB-S1-O 设备可以保持正向效果V _OC改善，因为在该器件中可以观察到非辐射电压损耗显着降低。我们的系统研究表明，不对称主链上的烷氧基取代是构建高性能三元有机太阳能电池第三组分的有效方法。

更新日期：2022-12-06

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