Quantitative relations between interaction parameter, miscibility and function in organic solar cells

Long Ye, Huawei Hu, Masoud Ghasemi, Tonghui Wang, Brian A. Collins, Joo Hyun Kim, Kui Jiang, Joshua H. Carpenter, Hong Li, Zhengke Li, Terry McAfee, Jingbo Zhao, Xiankai Chen, Joshua Lin Yuk Lai, Tingxuan Ma, Jean Luc Bredas, He Yan, Harald Ade

研究成果: Contribution to journalArticle査読

317 被引用数 (Scopus)

抄録

Although it is known that molecular interactions govern morphology formation and purity of mixed domains of conjugated polymer donors and small-molecule acceptors, and thus largely control the achievable performance of organic solar cells, quantifying interaction-function relations has remained elusive. Here, we first determine the temperature-dependent effective amorphous-amorphous interaction parameter, χ aa(T), by mapping out the phase diagram of a model amorphous polymer:fullerene material system. We then establish a quantitative 'constant-kink-saturation' relation between χ aa and the fill factor in organic solar cells that is verified in detail in a model system and delineated across numerous high- and low-performing materials systems, including fullerene and non-fullerene acceptors. Our experimental and computational data reveal that a high fill factor is obtained only when χ aa is large enough to lead to strong phase separation. Our work outlines a basis for using various miscibility tests and future simulation methods that will significantly reduce or eliminate trial-and-error approaches to material synthesis and device fabrication of functional semiconducting blends and organic blends in general.

本文言語英語
ページ(範囲)253-260
ページ数8
ジャーナルNature Materials
17
3
DOI
出版ステータス出版済み - 3 1 2018
外部発表はい

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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