Formation of Vitrified Solid Solution Enables Simultaneously Efficient and Stable Organic Solar Cells,ACS Energy Letters

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Formation of Vitrified Solid Solution Enables Simultaneously Efficient and Stable Organic Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-09-13 , DOI: 10.1021/acsenergylett.1c01576
Baobing Fan ₁ , Wei Gao ₁ , Ying Wang ₂ , Wenkai Zhong ₃ , Francis Lin ₁ , Wen Jung Li ₄ , Fei Huang ₅ , Kin-Man Yu ₂ , Alex K.-Y. Jen _{1,

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Affiliation

Employing a ternary blend as absorber is an ingenious tactic to achieve broad spectral coverage in single-junction organic photovoltaics. The incorporation of a second acceptor with relatively lower electron affinity (EA) is important for attaining increased open-circuit voltage (V_OC) of ternary devices. However, the common way in achieving a lower EA through tailoring the skeletons may affect the miscibility between acceptors, which inherently restrict the dependence of V_OC on compositions. Herein, we developed a low-EA acceptor through side-chain engineering to ensure similarity with another ultranarrow-bandgap acceptor, enabling a good miscibility between the two species and formation of a vitrified solid solution over a large range of compositions. As a result, continuously increased V_OC is realized, while the other parameters are less composition-sensitive. Besides, the vitrification facilitates intimate intermolecular interactions in ternary blends, suppressing thermally induced crystallization. Ultimately, increased photovoltaic efficiency and thermal stability are simultaneously achieved for the resulting ternary devices.

中文翻译：

玻璃化固溶体的形成可同时实现高效和稳定的有机太阳能电池

采用三元混合物作为吸收剂是一种巧妙的策略，可在单结有机光伏器件中实现广泛的光谱覆盖。加入具有相对较低电子亲和势 (EA) 的第二个受体对于提高三元器件的开路电压 ( V _OC )很重要。然而，通过定制骨架来实现较低 EA 的常见方法可能会影响受体之间的混溶性，这从本质上限制了V _OC的依赖性关于作文。在此，我们通过侧链工程开发了一种低 EA 受体，以确保与另一种超窄带隙受体的相似性，使两种物质之间具有良好的混溶性，并在大范围的组成范围内形成玻璃化固溶体。其结果是，连续地增加V _OC被实现，而其他的参数是以下的组合物敏感。此外，玻璃化促进了三元混合物中分子间的密切相互作用，抑制了热诱导结晶。最终，所得三元器件同时实现了光伏效率和热稳定性的提高。

更新日期：2021-10-08

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