Publication: Porphyrin Acceptors with Two Perylene Diimide Dimers for Organic Solar Cells
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Date
2021
Authors
Pan X.
Wu J.
Xiao L.
Yap B.
Xia R.
Peng X.
Journal Title
Journal ISSN
Volume Title
Publisher
John Wiley and Sons Inc
Abstract
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. � 2021 Wiley-VCH GmbH
Description
Additives; Dimers; Heterojunctions; Polycyclic aromatic hydrocarbons; Porphyrins; Synthesis (chemical); Bimolecular recombination; Bulk heterojunction organic solar cells; Charge generation; Electron-donating; Electronwithdrawing; Intermolecular packing; Power conversion efficiencies; Steric hindrances; Organic solar cells