Issue 3, 2018

Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups

Abstract

We choose the high-performance nonfullerene acceptor ITIC-Th as an example, and incorporate electron-donating methoxy and electron-withdrawing F groups onto the terminal group 1,1-dicyanomethylene-3-indanone (IC) to construct a small library of four fused-ring electron acceptors. With this series, we systematically investigate the effects of the substituents on the end-groups on the electronic properties, charge transport, film morphology, and photovoltaic properties of the ITIC-Th series. The electron-withdrawing ability increases from methoxylated to unsubstituted, fluorinated, and difluorinated IC, leading to a downshift of energy levels and a redshift of absorption spectra. Optimized organic solar cells based on the ITIC-Th series show power conversion efficiencies ranging from 8.88% to 12.1%.

Graphical abstract: Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups

Supplementary files

Article information

Article type
Research Article
Submitted
30 Pun 2017
Accepted
10 Phe 2018
First published
12 Phe 2018

Mater. Chem. Front., 2018,2, 537-543

Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups

Z. Li, S. Dai, J. Xin, L. Zhang, Y. Wu, J. Rech, F. Zhao, T. Li, K. Liu, Q. Liu, W. Ma, W. You, C. Wang and X. Zhan, Mater. Chem. Front., 2018, 2, 537 DOI: 10.1039/C7QM00547D

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