A perylene diimide electron acceptor with a triphenylamine core: promoting photovoltaic performance via hot spin-coating,Journal of Materials Chemistry C

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A perylene diimide electron acceptor with a triphenylamine core: promoting photovoltaic performance via hot spin-coating
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019/12/19 , DOI: 10.1039/c9tc05713g
Juan Hu _{1,

2,

3,

4,

5} , Xingbin Liu _{3,

4,

5,

6} , Kangwei Wang _{3,

4,

5,

6} , Mingliang Wu _{1,

2,

3,

4,

5} , Huaxi Huang _{1,

2,

3,

4,

5} , Di Wu _{1,

2,

3,

4,

5} , Jianlong Xia _{1,

2,

3,

4,

5}

Affiliation

Perylene diimide (PDI) oligomers, in which the PDI panels were fused together by ethylene bridges, have emerged as potential alternatives to the parent PDI in organic optoelectronic materials. Meanwhile, triphenylamine (TPA), owing to its facile synthesis, flexible modification, excellent electron donating capability and twisted molecular structure, is commonly employed as the congested core to construct star-shaped electron acceptors and donors for organic solar cells (OSCs). In this contribution, a TPA-cored helical perylene diimide oligomer (PDI2) electron acceptor, namely TPA-3PDI2, was designed and synthesized. Using the commercially available PTB7-Th as an electron donor, a power conversion efficiency (PCE) of 5.57% was obtained for the room temperature (RT) spin-coating blend based OSCs. Interestingly, the hot spin-coating blend based OSCs showed a higher PCE of 7.04%. The results demonstrate that using PDI2 as a building block to construct star-shaped acceptors is a facile strategy to achieve considerable PCEs in OSCs and also, hot spin-coating is a feasible method for morphology optimization.

中文翻译：

具有三苯胺核的per二酰亚胺电子受体：通过热旋涂提高光伏性能

ethylene二酰亚胺（PDI）低聚物（其中PDI面板通过乙烯桥融合在一起）已经成为有机光电材料中母体PDI的潜在替代品。同时，由于三苯胺（TPA）的合成简便，修饰灵活，给电子能力强和分子结构扭曲等优点，通常被用作拥挤的核，以构建星形的电子受体和有机太阳能电池（OSC）的供体。在这一贡献中，TPA核心的螺旋per二酰亚胺低聚物（PDI2）电子受体，即TPA-3PDI2，是设计和合成的。使用市售的PTB7-Th作为电子供体，对于基于室温（RT）旋涂共混物的OSC，可获得5.57％的功率转换效率（PCE）。有趣的是，基于热旋涂共混物的OSC的PCE更高，为7.04％。结果表明，使用PDI2作为构建星型受体的构建基块是在OSC中获得大量PCE的简便策略，而且热旋涂也是一种进行形态优化的可行方法。

更新日期：2020-02-13

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