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Highly Efficient Non-Fullerene Polymer Solar Cells from Benzo[1,2-b:4,5-b’]difuran-Based Conjugated Polymer with Improved Stabilities

Abstract

In this work, a novel benzo[1,2-b:4,5-b′]difuran (BDF)-based polymer (PDiFPBDF-TBz, F13) was designed and synthesized with a wide bandgap of 1.90eV. With advantage of electronegative fluorine and furan units, F13 possessed a deep HOMO level of -5.54eV, which is favorable for higher Voc in polymer solar cell (PSC). When F13 was blended with Y6, the device obtained a PCE of 12.7% with a Voc of 0.80V, a Jsc of 22.61 mA/cm2 and an FF of 70.28%. More surprisingly, the un-encapsulated pristine fabricated device will generate a higher PCE of up to 13.34% after storing under nitrogen or air. Further studies showed that the un-encapsulated devices could remain ~92% of its original PCEs even exposure to air in ~1150 hours and nitrogen in ~1370 hours, indicating very promising stabilities. This improvement was from the interfacial interaction of active layer and anode layer and the stable micromophological structure of F13:Y6 film. F13:Y6 device also exhibited a suppressed energy loss of 0.525eV, which is among the smallest one in BDF polymers-based NF-PSCs. These results demonstrate that the rational design of BDF polymer is highly critical in reaching the state-of-the-art photovoltaic performance and the long-term stability.

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Supplementary files

Article information


Submitted
07 Apr 2020
Accepted
19 May 2020
First published
20 May 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Highly Efficient Non-Fullerene Polymer Solar Cells from Benzo[1,2-b:4,5-b’]difuran-Based Conjugated Polymer with Improved Stabilities

E. He, Z. Zheng, Y. Lu, F. Guo, S. Gao, X. Pang, G. T. Mola, L. Zhao and Y. Zhang, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA03791E

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