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Near-IR absorption and photocurrent generation using a first-of-its-kind boron difluoride formazanate non-fullerene acceptor

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Abstract

Herein, we report the synthesis and characterization of the first non-fullerene acceptor (NFA) containing a boron difluoride formazanate (BF2fz) core end-capped with N-annulated perylene diimides (PDIs). Electronic coupling between the BF2fz core and the PDI endcaps enabled tuning of the lowest unoccupied molecular orbital, leading to near-panchromatic optical absorption. Post-deposition solvent vapor annealing of the new NFA resulted in a significant red-shift in the optical spectra, which stretched into the near-IR. Proof-of-concept organic photovoltaic (OPV) devices were constructed to demonstrate the potential of this new material as an NFA. SVA treatment of the active layer resulted in a 2-fold increase in power conversion efficiency (PCE), due mainly to increases in the BF2PDI2 generated photocurrent that extended into the near-IR.

Graphical abstract: Near-IR absorption and photocurrent generation using a first-of-its-kind boron difluoride formazanate non-fullerene acceptor

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Supplementary files

Article information


Submitted
26 Feb 2020
Accepted
06 Apr 2020
First published
08 Apr 2020

Mater. Chem. Front., 2020, Advance Article
Article type
Research Article

Near-IR absorption and photocurrent generation using a first-of-its-kind boron difluoride formazanate non-fullerene acceptor

J. D. B. Koenig, M. E. Farahat, J. S. Dhindsa, J. B. Gilroy and G. C. Welch, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QM00109K

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