Retarding the Crystallization of a Nonfullerene Electron Acceptor for High‐Performance Polymer Solar Cells,Advanced Functional Materials

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Retarding the Crystallization of a Nonfullerene Electron Acceptor for High‐Performance Polymer Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-12-10 , DOI: 10.1002/adfm.201807662
Wei Li _{1,

2} , Mengxue Chen _{1,

2} , Zhuohan Zhang ₃ , Jinlong Cai _{1,

2} , Huijun Zhang _{1,

2} , Robert S. Gurney _{1,

2} , Dan Liu _{1,

2} , Jiangsheng Yu ₃ , Weihua Tang ₃ , Tao Wang _{1,

2,

3}

Affiliation

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 π−π 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.

中文翻译：

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

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。在此，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的分子顺序，并证明了阻碍INPIC-4F结晶在实现高性能方面的关键作用。当PBDB‐T：INPIC‐4F在存在溶剂蒸气的情况下浇铸以延长组织时间时，INPIC‐4F分子会形成具有多晶结构的球晶，从而导致较大的相分离和低于10％的器件效率。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π-π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。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。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。

更新日期：2018-12-10

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