An A-D-D-A-type non-fullerene small-molecule acceptor with strong near-infrared absorption for high performance polymer solar cells

An acceptor-donor-donor-acceptor (A-D-D-A)-type near-infrared non-fullerene small-molecule acceptor IDT2-DFIC with indacenodithiophene-indacenodithiophene (IDT2) as a donating core and 2-(5,6-difluoro-3-oxo-2,3-dihydro-1 H -inden-1-ylidene)malononitrile (2FIC) as electron withdrawing end groups has...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2019, Vol.7 (42), p.1331-1336
Main Authors: Tan, Hua, Zheng, Xiangjun, Zhu, Jianing, Yu, Junting, Zhu, Weiguo
Format: Article
Language:English
Subjects:
Charge transport
Construction standards
Energy conversion efficiency
Energy levels
Fullerenes
Infrared absorption
Malononitrile
Morphology
Near infrared radiation
Photovoltaic cells
Solar cells
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Summary:An acceptor-donor-donor-acceptor (A-D-D-A)-type near-infrared non-fullerene small-molecule acceptor IDT2-DFIC with indacenodithiophene-indacenodithiophene (IDT2) as a donating core and 2-(5,6-difluoro-3-oxo-2,3-dihydro-1 H -inden-1-ylidene)malononitrile (2FIC) as electron withdrawing end groups has been synthesized. Compared to A-D-A-type small-molecule acceptor IDIC-4F , IDT2-DFIC exhibits a low optical bandgap of 1.42 eV with strong absorption in the 450-874 nm region, and upshifted energy levels as an electron acceptor. Furthermore, the IDT2-DFIC -based devices exhibited higher and more balanced charge transport and smoother surface morphology. The power conversion efficiency (PCE) of the IDT2-DFIC -based devices is 10.06%, which is higher than that of the IDIC-4F -based devices (5.17%). Our work provides an efficient molecular design strategy to construct small molecule acceptors with near-infrared absorption. An A-D-D-A-type near-infrared non-fullerene small-molecule acceptor IDT2-DFIC with indacenodithiophene-indacenodithiophene (IDT2) as donating core and 2-(5,6-difluoro-3-oxo-2,3-dihydro-1 H -inden-1-ylidene)malononitrile (2FIC) as electron withdrawing end groups has been synthesized.
ISSN:2050-7526
2050-7534
DOI:10.1039/c9tc04898g