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Issue 4, 2019
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Perylene diimide based star-shaped small molecular acceptors for high efficiency organic solar cells

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Abstract

We designed and synthesized three PDI derivatives (PDI-II, PDI-III and PDI-IV). All these acceptor molecules have a central benzene core and the PDI units are linked to the central benzene core by an acetylene spacer. PDI-II is a linear molecule, which bears two flanked PDI units, PDI-III is a c3-symmetrical star-shaped molecule with three peripheral PDI units, and PDI-IV is a star-shaped molecule with four PDI units linked to the 1,2,4,5-positions of the central benzene core. These absorption features indicated that the PDI units in PDI-II and PDI-III are planar, whereas the PDI units in PDI-IV are twisted due to the steric crowding. Compared with the linear PDI-II, the star-shape could effectively prevent PDI-III and PDI-IV from forming large aggregates when blended with the donor polymer PBDB-T. PBDB-T:PDI-II, PBDB-T:PDI-III and PBDB-T:PDI-IV based OSCs gave power conversion efficiencies (PCEs) of 3.05%, 6.00% and 1.04%, respectively. The big differences in electron mobility and PCE for PDI-III and PDI-IV are probably due to the fact that the PDI units in PDI-III are planar and those in PDI-IV are twisted.

Graphical abstract: Perylene diimide based star-shaped small molecular acceptors for high efficiency organic solar cells

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Publication details

The article was received on 23 Oct 2018, accepted on 25 Dec 2018 and first published on 01 Jan 2019


Article type: Communication
DOI: 10.1039/C8TC05332D
Citation: J. Mater. Chem. C, 2019,7, 819-825

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    Perylene diimide based star-shaped small molecular acceptors for high efficiency organic solar cells

    H. Wang, M. Li, Y. Liu, J. Song, C. Li and Z. Bo, J. Mater. Chem. C, 2019, 7, 819
    DOI: 10.1039/C8TC05332D

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