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Issue 9, 2018
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Two-dimensional benzo[1,2-b:4,5-b′]difuran-based wide bandgap conjugated polymers for efficient fullerene-free polymer solar cells

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Abstract

Wide bandgap conjugated polymers are important for providing complementary absorption with the state-of-the-art narrow bandgap nonfullerene electron acceptors to maximise the utilization of solar photons. In this work, two wide bandgap two-dimensional conjugated polymers, PBDFT–Bz and PBDFF–Bz, based on benzo[1,2-b:4,5-b′]difuran building block were designed and synthesized. The optical bandgaps of PBDFT–Bz and PBDFF–Bz were found to be 1.90 eV and 1.85 eV, respectively. PBDFF–Bz with 2-ethylhexylfuryl side chains possesses the lower HOMO energy level and shows denser π–π stacking compared to PBDFT–Bz with 2-ethylhexylthienyl side chains. The fullerene-free PBDFF–Bz:ITIC-based polymer solar cell (PSC) showed a PCE of 9.46% with a Jsc of 15.02 mA cm−2, a Voc of 0.94 V and a FF of 67%; by using m-ITIC as an electron acceptor, the PCE was further improved to 10.28% with an enhanced Jsc of 16.57 mA cm−2, a Voc of 0.94 V and a FF of 66%. Under the same condition, the PBDFT–Bz:m-ITIC device gave a PCE of 9.84% with a Jsc of 16.63 mA cm−2, a Voc of 0.85 V and a FF of 70%. In addition, it is exciting that the PBDFF–Bz based devices show a small energy loss (Eloss) of 0.63 eV, while the PBDFT–Bz based devices show an Eloss of 0.72 eV. These results are among the best for fullerene-free devices with BDF-based polymers, and demonstrate that BDF is a very promising candidate for highly efficient polymer solar cells.

Graphical abstract: Two-dimensional benzo[1,2-b:4,5-b′]difuran-based wide bandgap conjugated polymers for efficient fullerene-free polymer solar cells

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Supplementary files

Article information


Submitted
15 Dec 2017
Accepted
30 Jan 2018
First published
31 Jan 2018

J. Mater. Chem. A, 2018,6, 4023-4031
Article type
Paper

Two-dimensional benzo[1,2-b:4,5-b′]difuran-based wide bandgap conjugated polymers for efficient fullerene-free polymer solar cells

Y. Gao, Z. Wang, J. Zhang, H. Zhang, K. Lu, F. Guo, Y. Yang, L. Zhao, Z. Wei and Y. Zhang, J. Mater. Chem. A, 2018, 6, 4023
DOI: 10.1039/C7TA10976H

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