Horizontal-, Vertical-, and Cross-Conjugated Small Molecules: Conjugated Pathway-Performance Correlations along Operation Mechanisms in Ternary Non-Fullerene Organic Solar Cells.,Small

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Horizontal-, Vertical-, and Cross-Conjugated Small Molecules: Conjugated Pathway-Performance Correlations along Operation Mechanisms in Ternary Non-Fullerene Organic Solar Cells.
Small ( IF 13.0 ) Pub Date : 2020-01-10 , DOI: 10.1002/smll.201905309
Sang Myeon Lee ₁ , Tanya Kumari ₁ , Byongkyu Lee ₁ , Yongjoon Cho ₁ , Jungho Lee ₁ , Jiyeon Oh ₁ , Mingyu Jeong ₁ , Sungwoo Jung ₁ , Changduk Yang ₁

Affiliation

A family of the SM-axis series based on benzo[1,2-b:4,5-b']dithiophene and 3-ethylrhodanine (RD) units with structurally different π-conjugation systems are synthesized as a means to understand the structure-property relationship of conjugated pathways in ternary non-fullerene organic solar cells (NF-OSCs) as a third component. The optical and electrochemical properties of the SM-axis are highly sensitive both to the functionalized direction and to the number of RD groups. Enhanced power conversion efficiencies (PCEs) of over 11% in ternary devices are obtained by incorporating optimal SM-X and SM-Y contents from PBDB-T:ITIC binary NF-OSCs, while a slightly lower PCE is observed with the addition of SM-XY. The results of in-depth studies using various characterization techniques demonstrate that working mechanisms of SM-axis-based ternary NF-OSCs are distinctly different from one another: an energy-transfer mechanism with an alloy-like model for SM-X, a charge transfer with the same model for SM-Y, and an energy transfer without such a structure for SM-XY. As extension of the scope, a SM-X-based ternary NF-OSC in the PM6:IT4F system also shows a greatly enhanced PCE of over 13%. The findings provide insights into the effects of conjugated pathways of organic semiconductors on mechanisms of ternary NF-OSCs, advancing the understanding for synthetic chemists, materials engineers, and device physicists.

中文翻译：

水平，垂直和交叉共轭的小分子：三元非富勒烯有机太阳能电池中沿运行机制的共轭通路性能相关性。

合成了基于苯并[1,2-b：4,5-b']二噻吩和3-乙基罗丹宁（RD）单元的结构不同的π共轭体系的SM轴系列，作为理解结构的一种手段非富勒烯三元有机太阳能电池（NF-OSCs）中共轭途径的第三性质。SM轴的光学和电化学性质对官能化方向和RD基团的数量都高度敏感。通过结合PBDB-T：ITIC二元NF-OSC中的最佳SM-X和SM-Y含量，可将三元器件的功率转换效率（PCE）提高11％以上，而添加SM则可观察到稍低的PCE -XY。使用各种表征技术进行的深入研究的结果表明，基于SM轴的三元NF-OSC的工作机制彼此明显不同：一种具有类似于SM-X合金模型的能量传递机制，即电荷对于SM-Y，具有相同模型的能量传递；对于SM-XY，不具有此类结构的能量传递。作为范围的扩展，PM6：IT4F系统中基于SM-X的三元NF-OSC还显示PCE大大提高了13％以上。这些发现提供了对有机半导体共轭途径对三元NF-OSC机理的影响的见解，从而促进了对合成化学家，材料工程师和装置物理学家的理解。对于SM-Y，具有相同模型的电荷转移；对于SM-XY，没有这种结构的能量转移。作为范围的扩展，PM6：IT4F系统中基于SM-X的三元NF-OSC还显示PCE大大提高了13％以上。这些发现提供了对有机半导体共轭途径对三元NF-OSC机理的影响的见解，从而促进了对合成化学家，材料工程师和装置物理学家的理解。对于SM-Y，具有相同模型的电荷转移；对于SM-XY，没有这种结构的能量转移。作为范围的扩展，PM6：IT4F系统中基于SM-X的三元NF-OSC还显示PCE大大提高了13％以上。这些发现提供了对有机半导体共轭途径对三元NF-OSC机理的影响的见解，从而促进了对合成化学家，材料工程师和装置物理学家的理解。

更新日期：2020-02-07

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