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

Abstract

Recent studies have demonstrated the superior photovoltaic properties of acceptordonor-acceptor (A-D-A) type non-fullerene small molecular acceptors. By modifying the donor/acceptor units and/or the side chains, the optical and electrical properties and morphology of such acceptors can be easily tuned. However, the design of highly efficient acceptors should abide by some fundamental guidelines. Herein, the crucial role of intermolecular π-π interactions on the charge transport properties, and thus photovoltaic performance, of these types of acceptors is demonstrated. By side chain manipulation, two small molecular 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 intermolecular π-π interactions relative to IDT-PhC6. Benefiting from the improved charge transport property of the IDT-C6-based device, a high PCE of 12.5% is recorded, whereas that of the IDT-PhC6-based device delivers a moderate PCE of just 5.6%. The results suggest that strong intermolecular π-π interactions are a prerequisite for highly efficient A-D-A-type small molecular acceptors.

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Publication details

The article was received on 28 Nov 2017, accepted on 04 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA10461H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    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, Accepted Manuscript , DOI: 10.1039/C7TA10461H

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