Issue 23, 2016

Conjugated donor–acceptor terpolymers entailing the Pechmann dye and dithienyl-diketopyrrolopyrrole as co-electron acceptors: tuning HOMO/LUMO energies and photovoltaic performances

Abstract

Three conjugated D–A terpolymers PBPD1, PBPD2, and PBPD3 with the Pechmann dye-derived electron acceptor and dithienyl-diketopyrrolopyrrole as co-acceptors are presented. Their HOMO/LUMO energies and absorptions can be tuned by varying the ratios of two acceptors. Importantly, HOMO energies of these terpolymers are lowered by increasing the content of the Pechmann dye-derived electron acceptor in the conjugated backbones. The thin blend films of PBPD1, PBPD2, and PBPD3 with PC71BM have been tested as active layers for polymer solar cells. The blend of PBPD1:PC71BM shows a high power conversion efficiency of up to 5.21%, which is higher than that with the blend of the dithienyl-diketopyrrolopyrrole-based polymer without the Pechmann dye-derived electron acceptor and PC71BM. In addition, the neat thin films of PBPD1, PBPD2, and PBPD3 exhibit ambipolar semiconducting properties with hole and electron mobilities up to 0.604 cm2 V−1 s−1 and 0.225 cm2 V−1 s−1.

Graphical abstract: Conjugated donor–acceptor terpolymers entailing the Pechmann dye and dithienyl-diketopyrrolopyrrole as co-electron acceptors: tuning HOMO/LUMO energies and photovoltaic performances

Supplementary files

Article information

Article type
Paper
Submitted
06 Mar 2016
Accepted
26 Apr 2016
First published
27 Apr 2016

Polym. Chem., 2016,7, 3838-3847

Conjugated donor–acceptor terpolymers entailing the Pechmann dye and dithienyl-diketopyrrolopyrrole as co-electron acceptors: tuning HOMO/LUMO energies and photovoltaic performances

P. Qi, Z. Wang, Z. Liu, S. Yang, Y. Yang, J. Yao, G. Zhang and D. Zhang, Polym. Chem., 2016, 7, 3838 DOI: 10.1039/C6PY00400H

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