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A small-molecule acceptor incorporating a silicon bridging atom for efficient nonfullerene polymer solar cells

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Abstract

Recently, there have been rapid advances in polymer solar cells (PSCs) based on nonfullerene small-molecule acceptors (n-SMAs) due to their outstanding properties. Silicon, which is a member of group 14 in the periodic table, may endow small-molecule acceptors with unique properties, especially when it is incorporated into conjugated backbones. In this work, a narrow band gap n-SMA based on a dithienosilole (DTS) unit incorporating silicon bridging atom, named Si4TIC-F, was designed and synthesized. Si4TIC-F has a rigid, planar conjugated backbone, benefiting intermolecular stacking and charge transport. Pairing Si4TIC-F with a wide band gap copolymer, poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]-dithiophene-alt-N-(2-hexyldecyl)-5′5-bis[3-(decylthio)thiophene-2-yl]-2′2-bithiophene-3′3-dicarboximide] (PBTIBDTT), achieved a power conversion efficiency (PCE) of 10.2%. The PCE is much better than those of other systems with DTS-based acceptors. Our results demonstrate the potential of the classical DTS unit in constructing new n-SMAs to realize high-performance nonfullerene PSCs, which will help advance the development of PSCs.

Graphical abstract: A small-molecule acceptor incorporating a silicon bridging atom for efficient nonfullerene polymer solar cells

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Publication details

The article was received on 27 Sep 2018, accepted on 31 Oct 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC04883E
Citation: J. Mater. Chem. C, 2018, Advance Article
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    A small-molecule acceptor incorporating a silicon bridging atom for efficient nonfullerene polymer solar cells

    G. Zeng, J. Ouyang, Y. Xin, X. Zhao and X. Yang, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC04883E

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