Issue 6, 2018

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

Abstract

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%.

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

Supplementary files

Article information

Article type
Paper
Submitted
28 Nov 2017
Accepted
04 Jan 2018
First published
04 Jan 2018

J. Mater. Chem. A, 2018,6, 2664-2670

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

B. Gao, H. Yao, B. Jang, J. Zhu, R. Yu, Y. Cui, F. Wang, J. Hou, H. Y. Woo and J. Hou, J. Mater. Chem. A, 2018, 6, 2664 DOI: 10.1039/C7TA10461H

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