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Retarding the Crystallization of a Nonfullerene Electron Acceptor for High-Performance Polymer Solar Cells

机译：阻滞用于高性能聚合物太阳能电池的非富勒烯电子受体的结晶

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摘要

Developing a fundamental understanding of the molecular order within the photoactive layer, and the influence therein of solution casting conditions, is a key factor in obtaining high power conversation efficiency (PCE) polymer solar cells. Herein, the molecular order in PBDB-T:INPIC-4F nonfullerene solar cells is tuned by control of the molecular organization time during film casting, and the crucial role of retarding the crystallization of INPIC-4F in achieving high performance is demonstrated. When PBDB-T:INPIC-4F is cast with the presence of solvent vapor to prolong the organization time, INPIC-4F molecules form spherulites with a polycrystalline structure, resulting in large phase separation and device efficiency below 10%. On the contrary, casting the film on a hot substrate is effective in suppressing the formation of the polycrystalline structure, and encourages face-on pi-pi stacking of INPIC-4F. This molecular transformation of INPIC-4F significantly enhances the absorption ability of INPIC-4F at long wavelengths and facilitates a fine phase separation to support efficient exciton dissociation and balanced charge transport, leading to the achievement of a maximum PCE of 13.1%. This work provides a rational guide for optimizing nonfullerene polymer solar cells consisting of highly crystallizable small molecular electron acceptors.
机译：对光敏层内的分子顺序及其在溶液浇铸条件中的影响的基本了解是获得高功率转换效率（PCE）聚合物太阳能电池的关键因素。本文中，通过控制薄膜浇铸过程中的分子组织时间来调节PBDB-T：INPIC-4F非富勒烯太阳能电池中的分子顺序，并证明了在实现高性能方面阻碍INPIC-4F结晶的关键作用。当在溶剂蒸汽存在下浇铸PBDB-T：INPIC-4F来延长组织时间时，INPIC-4F分子形成具有多晶结构的球晶，导致相分离大且器件效率低于10％。相反，将膜浇铸在热的基材上可有效抑制多晶结构的形成，并促进INPIC-4F的正面pi-pi堆叠。 INPIC-4F的这种分子转化极大地增强了INPIC-4F在长波长下的吸收能力，并促进了精细的相分离，以支持有效的激子离解和平衡的电荷传输，从而实现了13.1％的最大PCE。这项工作为优化由高度可结晶的小分子电子受体组成的非富勒烯聚合物太阳能电池提供了合理的指导。

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  • 来源
    《Advanced Functional Materials》 |2019年第5期|1807662.1-1807662.8|共8页
  • 作者

    Li Wei; Chen Mengxue; Zhang Zhuohan; Cai Jinlong; Zhang Huijun; Gurney Robert S.; Liu Dan; Yu Jiangsheng; Tang Weihua; Wang Tao;

  • 作者单位

    Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China|Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China|Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China|Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China|Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China|Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China|Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China|Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    crystallization; nonfullerene acceptor; polymer solar cells; power conversion efficiency;

    机译：结晶;非富勒烯受体;聚合物太阳能电池;功率转换效率;

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