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Tuning the molecular geometry and packing mode of non-fullerene acceptors by altering the bridge atoms towards efficient organic solar cells

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Abstract

To investigate the effect of bridge atoms on the properties of non-fullerene acceptors, we designed two analogues by changing only one atom and report the first germanium based non-fullerene acceptor GDIC-C8. Compared to its analogue IDIC-C8, altering the bridge atom from carbon to germanium dramatically leads to a more planar molecular geometry. GDIC-C8 tends to form a 1D lamellar/slip-stack packing while IDIC-C8 represents a reticular motif packing in a single crystal. This unique structure greatly enhances the crystallinity of GDIC-C8 in single crystal and neat films, evidenced by X-ray single crystal diffraction and atomic force microscopy measurements. However, GDIC-C8 prefers to form edge-on π–π stacking when blended with a donor polymer PM6. In addition, the extremely high crystallinity of GDIC-C8 restrains competitively the crystallization of PM6 in the blend film. These features lead to an inferior photovoltaic performance of GDIC-C8 compared to IDIC-C8. This work systematically studies the effect of bridge atoms on molecular geometry and packing and reveals the importance of the bridge atom in the fused-ring semiconductors for the modulation of optoelectronic properties and device performance.

Graphical abstract: Tuning the molecular geometry and packing mode of non-fullerene acceptors by altering the bridge atoms towards efficient organic solar cells

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Article information


Submitted
30 Apr 2020
Accepted
16 Jun 2020
First published
17 Jun 2020

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

Tuning the molecular geometry and packing mode of non-fullerene acceptors by altering the bridge atoms towards efficient organic solar cells

Y. Zhang, Z. Liu, T. Shan, Y. Wang, L. Zhu, T. Li, F. Liu and H. Zhong, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QM00277A

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