Thioether Bond Modification Enables Boosted Photovoltaic Performance of Nonfullerene Polymer Solar Cells,ACS Applied Materials & Interfaces

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Thioether Bond Modification Enables Boosted Photovoltaic Performance of Nonfullerene Polymer Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-08-14 00:00:00 , DOI: 10.1021/acsami.9b11700
Youdi Zhang , Ying Wang , Tao Yang ₁ , Tao Liu ₂ , Yiqun Xiao ₃ , Xinhui Lu ₃ , He Yan ₂ , Zhongyi Yuan , Yiwang Chen ₄ , Yongfang Li ₅

Affiliation

A small-molecule nonfullerene acceptor, ITIC-S, bearing a fused heptacyclic benzodi(cyclopentadithiophene) core with a thioether-bond-substituted thiophene, is designed, synthesized, and compared with its alkyl-substituted analog, ITIC2. Compared with ITIC2, ITIC-S with a thioether bond exhibits higher electron mobility, a slightly larger optical band gap, and similar absorption. The active layer incorporating ITIC-S and the wide-bandgap polymeric donor PBDB-T-SF displays a smaller crystalline coherent length of π–π stacking, more balanced mobilities, weaker bimolecular recombination, and more effective charge collection than its PBDB-T-SF:ITIC2 counterpart. Accordingly, polymer solar cells incorporating ITIC-S and PBDB-T-SF demonstrate a fill factor (FF) of 66.8% and a champion power conversion efficiency (PCE) of 11.6%, exceeding those of the PBDB-T-SF:ITIC2 blend (PCE = 10.1%, FF = 59.7%), which shows that the thioether bond substitution strategy is an easy yet viable way for designing high-performance electron acceptors.

中文翻译：

硫醚键改性可增强非富勒烯聚合物太阳能电池的光伏性能

设计，合成了一个小分子的非富勒烯受体ITIC-S，它带有稠合的七环苯并二（环戊二噻吩）核和硫醚键取代的噻吩，并与烷基取代的类似物ITIC2进行了比较。与ITIC2相比，具有硫醚键的ITIC-S具有更高的电子迁移率，稍大的光学带隙和相似的吸收率。结合了ITIC-S和宽带隙聚合物供体PBDB-T-SF的活性层比PBDB-T-具有更小的π-π堆积的晶体相干长度，更平衡的迁移率，更弱的双分子重组以及更有效的电荷收集SF：ITIC2对应对象。因此，结合了ITIC-S和PBDB-T-SF的聚合物太阳能电池的填充系数（FF）为66.8％，冠军功率转换效率（PCE）为11.6％，

更新日期：2019-08-14

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