Modifying the morphology via employing rigid phenyl side chains achieves efficient nonfullerene polymer solar cells,Journal of Polymer Science Part A: Polymer Chemistry

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Modifying the morphology via employing rigid phenyl side chains achieves efficient nonfullerene polymer solar cells
Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2018-10-30 , DOI: 10.1002/pola.29264
Yaqian Zhong _{1,

2} , Deyu Liu _{2,

3} , Kaili Zhang _{1,

2} , Yonghai Li ₂ , Mingliang Sun _{1,

4} , Liangmin Yu ₄ , Feng Li ₅ , Huizhou Liu ₂ , Renqiang Yang ₂

Affiliation

As a promising electron‐deficient (acceptor) unit, fluorinated benzotriazole (TAZ) was used widely to construct wide bandgap polymers for nonfullerene polymer solar cells (NF‐PSCs). However, due to the S…F noncovalent interaction, the unit show good planarity and strong aggregation, which was not beneficial for the blend with the elongated nonfullerene acceptors. Here, we tried to choose new donor polymers to match with TAZ unit, which was expected to destroy the interchain aggregation of polymer and form favorable morphology of blends. Two new wide‐bandgap polymers PBDTsPhPh‐T1 and PBDTsThPh‐T1 based on the unsymmetrical benzodithiophene (BDT) units with a benzene ring as lever arms were synthesized. As a result, these two polymers blend well with nonfullerene acceptor (ITIC). And then, PBDTsPhPh‐T1 and PBDTsThPh‐T1‐based devices exhibit the decent photovoltaic properties with high power conversion efficiencies of 8.85 and 9.34%, respectively. The work demonstrates that the unsymmetrical BDT units could be outstanding for building donor materials toward high‐performance NF‐PSCs. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 2762–2770

中文翻译：

通过使用刚性苯基侧链来改变形态，可实现高效的非富勒烯聚合物太阳能电池

氟化苯并三唑（TAZ）作为一种有前途的电子缺乏（受体）单元，被广泛用于构建非富勒烯聚合物太阳能电池（NF-PSC）的宽带隙聚合物。但是，由于S…F非共价相互作用，该单元显示出良好的平面性和强聚集性，这不利于与伸长的非富勒烯受体共混。在这里，我们尝试选择新的供体聚合物以与TAZ单元匹配，这有望破坏聚合物的链间聚集并形成良好的共混物形态。基于具有苯环作为杠杆臂的不对称苯并二噻吩（BDT）单元，合成了两种新型的宽带隙聚合物PBDTsPhPh-T1和PBDTsThPh-T1。结果，这两种聚合物与非富勒烯受体（ITIC）很好地共混。进而，基于PBDTsPhPh-T1和基于PBDTsPhPh-T1的器件具有良好的光伏性能，分别具有8.85％和9.34％的高功率转换效率。这项工作表明，不对称的BDT单元对于为高性能NF-PSC建造供体材料而言可能是杰出的。©2018 Wiley Periodicals，Inc.J.Polym。科学，A部分：Polym。化学2018，56，2762年至2770年

更新日期：2018-10-30

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