4.8 Article

Porphyrin Acceptors with Two Perylene Diimide Dimers for Organic Solar Cells

Journal

CHEMSUSCHEM
Volume 14, Issue 17, Pages 3614-3621

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202100787

Keywords

organic electronics; organic solar cells; perylene diimide; porphyrin; small molecule

Funding

  1. National Key Research and Development Program of China [2017YFA0206602]
  2. National Natural Science Foundation of China [51773065, 51861145301, 51903057]

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Three small moleculer acceptors were synthesized with different side chains, and the bulk heterojunction organic solar cells based on these acceptors and a polymer donor showed different power conversion efficiencies after adding pyridine additives. Among them, devices based on Por-PDI exhibited the best performance.
Three small-molecule acceptors (Por-PDI, TEHPor-PDI, and BBOPor-PDI) with different side chains were synthesized by using a porphyrin core as the electron-donating unit and connecting electron-withdrawing perylene diimide dimers via acetylene bridges. The bulk heterojunction organic solar cells based on the three acceptors and a polymer donor provided power conversion efficiencies (PCEs) of 3.68-5.21 % when the active layers were fabricated with pyridine additives. Though the synthesis of Por-PDI is easier with fewer reaction steps and higher yields, the devices based on Por-PDI showed the best performance with a PCE of 5.21 %. The more ordered intermolecular packing due to the reduced steric hindrance at the porphyrin core of Por-PDI could contribute to the more balanced hole/electron mobilities, higher maximum charge generation rate, and less bimolecular recombination in Por-PDI devices, which are beneficial for the higher PCE.

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