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Over 17% efficiency all-small-molecule organic solar cells based on an organic molecular donor employing a 2D side chain symmetry breaking strategy
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2022-08-31 , DOI: 10.1039/d2ee02107b
Zhiya Li, Xunchang Wang, Nan Zheng, Aziz Saparbaev, Jiayi Zhang, Cong Xiao, Shiyun Lei, Xufan Zheng, Manxue Zhang, Yuda Li, Biao Xiao, Renqiang Yang

The symmetry breaking strategy has been broadly applied in the design of organic photovoltaic materials; however, a comprehensive understanding of the effects of two-dimensional (2D) asymmetric side chains in all-small-molecule organic solar cells (ASM-OSCs) is rarely studied. Herein, a new building block based on an asymmetric 2D side chain with halogen modification was designed for the construction of small molecular donors to fine-tune bulk heterojunction thin films and electronic properties. In comparison with the symmetric BTR-Cl, its asymmetric counterparts, i.e., TB- and TB-F-based blends, exhibited the optimal hierarchical morphology with multi-scale domains, enhanced D/A molecular interactions and interfacial packing at the unilateral chain, and homogeneous vertical phase distribution. Transient absorption measurement revealed that an enhanced exciton diffusion coefficient and fast exciton dissociation process were achieved in the TB-F based device, enabling more percolation paths for charge transport, suppressed bimolecular recombination and reduced energy disorder. Consequently, a champion efficiency of 17.0% with a remarkably increased short-circuit current density and fill factor was recorded in the binary ASM-OSCs. Overall, this work elucidates the important 2D side chain symmetry breaking strategy, which precisely controls and optimizes the material properties and gives design inspiration for the future higher performance of ASM-OSCs.

中文翻译:

基于采用二维侧链对称破坏策略的有机分子供体的效率超过 17% 的全小分子有机太阳能电池

对称破缺策略已广泛应用于有机光伏材料的设计;然而,对二维(2D)不对称侧链在全小分子有机太阳能电池(ASM-OSCs)中的影响的全面了解却很少被研究。在此,设计了一种基于具有卤素修饰的不对称二维侧链的新结构单元,用于构建小分子供体,以微调体异质结薄膜和电子特性。与对称 BTR-Cl 相比,它的不对称对应物,,TB-和TB-F基共混物,表现出具有多尺度域的最佳分层形态,增强的D / A分子相互作用和单侧链的界面堆积,以及均匀的垂直相分布。瞬态吸收测量表明,基于 TB-F 的器件实现了增强的激子扩散系数和快速的激子解离过程,为电荷传输提供了更多的渗透路径,抑制了双分子复合并减少了能量无序。因此,在二元 ASM-OSC 中记录了 17.0% 的冠军效率以及显着增加的短路电流密度和填充因子。总的来说,这项工作阐明了重要的二维侧链对称破坏策略,
更新日期:2022-08-31
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