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Introducing Cyclic Alkyl Chain into Small-Molecule Acceptor for Efficient Polymer Solar Cells

Abstract

A new acceptor-donor-acceptor type small molecular acceptor, namely IDT-HN, is developed, which consists of a newly developed 2-(3-oxo-2,3,5,6,7,8-hexahydro-1H-cyclopenta[b]naphthalen-1-ylidene)malononitrile as the peripheral electron-withdrawing group and indaceno[1,2-b:5,6-b′]dithiophene as the electron-donating core. Compared with the reference molecule (IDT-IC) that bears phenyl-fused indanone as the end groups, IDT-HN exhibited elevated lowest unoccupied molecular orbital level. By utilizing IDT-HN as the electron acceptor and a wide bandgap conjugated polymer PBDB-T as the electron donor, optimized devices exhibited an impressively high power conversion efficiency of up to 10.22% with simultaneously improved open-circuit voltage, short-circuit current and fill factor. The improved photovoltaic performance can be attributed to the widened and intensified absorption spectra, improved electron mobility, more ordered π-π packing structure, and the symmetric carrier transport mobility of IDT-HN-based blend with regard to those obtained from devices based on the reference molecule IDT-IC. These results indicate that the incorporated cyclic alkyl moiety into the peripheral groups plays a critical role in improving the performance of the corresponding solar cell devices. In addition, the power conversion efficiency of the devices remains at 91% of its optimum performance with film thickness of 250 nm, indicating a great potential for future practical application.

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Publication details

The article was received on 16 Apr 2018, accepted on 11 Jun 2018 and first published on 13 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC01780H
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Introducing Cyclic Alkyl Chain into Small-Molecule Acceptor for Efficient Polymer Solar Cells

    R. Li, G. Liu, R. Xie, Z. Wang, X. Yang, K. An, W. Zhong, X. Jiang, L. Ying, F. Huang and Y. Cao, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01780H

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