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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Effect of Alkyl Side Chain Length on Intra- and Intermolecular Interactions of Terthiophene-Isoindigo Copolymers
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Effect of Alkyl Side Chain Length on Intra- and Intermolecular Interactions of Terthiophene-Isoindigo Copolymers

机译：烷基侧链长度对三苯甲酸异吲哚共聚物的分子间相互作用的影响

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摘要

Two terthiophene-isoindigo copolymers (P3TI-O and P3TI-D) were successfully designed and synthesized. Octyl (O) and dodecyl (D) alkyl side chains were appended at the third position of the first and fourth positions of the last thiophene on the terthiophene donor units in P3TI-O and P3TI-D, respectively. The band gaps of these copolymers were less than 1.7 eV. We found intramolecular charge-transfer states in both copolymers, which were generated with time constants of 4.5 and 13 ps for the copolymers with short and long alkyl side chains on their donor units, respectively. These results indicate that an almost 3-fold faster intramolecular charge-transfer process occurs when the alkyl side chains are shortened by four methyl units. Owing to a better interchain charge transfer, P3TI-O exhibits a more efficient exciton diffusion compared to P3TI-D, thus leading to longer exciton lifetimes in the copolymer with shorter alkyl side chains. Consequently, when blended with PC71BM in bulk heterojunctions, P3TI-O showed a better exciton dissociation efficiency compared to P3TI-D. These results correlate well with the higher short-circuit current densities observed in P3TI-O:PC71BM inverted architecture organic solar cells compared to the P3TI-D:PC71BM ones.
机译：成功设计和合成了两种三萜烯 - 异吲哚共聚物（P3TI-O和P3TI-D）。辛基（O）和十二烷基（D）烷基侧链分别在P3TI-O和P3TI-D中的噻吩供体单元上的最后一个噻吩的第三位和第四位的第三位。这些共聚物的带间隙小于1.7eV。我们发现两种共聚物中的分子内电荷转移状态，分别在其供体单元上的短期和长烷基侧链的共聚物为4.5和13 ps的时间常数产生。这些结果表明，当烷基侧链被四个甲基单元缩短时，发生几乎3倍的分子内电荷转移过程。由于与P3TI-D相比，P3Ti-O表现出更有效的激子扩散，从而导致与短烷基侧链的共聚物中的更长的激子寿命。因此，与PC71BM中的PC71BM混合，与P3TI-D相比，P3TI-O显示出更好的激子解离效率。这些结果与P3TI-O中观察到的较高的短路电流密度相比，与P3TI-D：PC71BM载体相比，P31BM倒置架构有机太阳能电池相比良好。

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