The crucial role of intermolecular π–π interactions in A–D–A-type electron acceptors and their effective modulation

Here, the crucial role of intermolecular π–π interactions in A–D–A-type acceptors is examined and a simple yet effective modulation method is presented. By side chain manipulation, two small molecule acceptors, IDT-C6 and IDT-PhC6, are designed and synthesized with different crystalline morphologies...

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Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (6), p.2664-2670
Hauptverfasser: Gao, Bowei, Yao, Huifeng, Jang, Bomee, Zhu, Jie, Yu, Runnan, Cui, Yong, Wang, Fenghao, Hou, Junxian, Woo, Han Young, Hou, Jianhui
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Sprache:eng
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Zusammenfassung:Here, the crucial role of intermolecular π–π interactions in A–D–A-type acceptors is examined and a simple yet effective modulation method is presented. By side chain manipulation, two small molecule acceptors, IDT-C6 and IDT-PhC6, are designed and synthesized with different crystalline morphologies. Since n -hexyl side chains have less steric hindrance than hexylphenyl side chains, IDT-C6 exhibits enhanced intermolecular π–π interactions relative to IDT-PhC6. Benefiting from the improved charge transport properties of the IDT-C6-based device, a high PCE of 12.5% is recorded, whereas those of the IDT-PhC6-based device delivers a moderate PCE of just 5.6%.
ISSN:2050-7488
2050-7496
DOI:10.1039/C7TA10461H