Development of n-type porphyrin acceptors for panchromatic light-harvesting fullerene-free organic solar cells

Un Hak Lee, Wisnu Tantyo Hadmojo, Junho Kim, Seung Hun Eom, Sung Cheol Yoon*, Sung Yeon Jang, In Hwan Jung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The development of n-type porphyrin acceptors is challenging in organic solar cells. In this work, we synthesized a novel n-type porphyrin acceptor, PZn-TNI, via the introduction of the electron withdrawing naphthalene imide (NI) moiety at the meso position of zinc porphyrin (PZn). PZn-TNI has excellent thermal stability and unique bimodal absorption with a strong Soret band (300-600 nm) and weak Q-band (600-800 nm). The weak long-wavelength absorption of PZn-TNI was completely covered by combining the low bandgap polymer donor, PTB7-Th, which realized the well-balanced panchromatic photon-to-current conversion in the range of 300-800 nm. Notably, the one-step reaction of the NI moiety from a commercially available source leads to the cheap and simple n-type porphyrin synthesis. The substitution of four NIs in PZn ring induced sufficient n-type characteristics with proper HOMO and LUMO energy levels for efficient charge transport with PTB7-Th. Fullerene-free organic solar cells based-on PTB7-Th:PZn-TNI were investigated and showed a promising PCE of 5.07% without any additive treatment. To the best of our knowledge, this is the highest PCE in the porphyrin-based acceptors without utilization of the perylene diimide accepting unit.

Original languageEnglish (US)
Article number473
JournalFrontiers in Chemistry
Issue numberSEP
StatePublished - Sep 1 2018


  • N-type porphyrins
  • Non-fullerene acceptors
  • Organic solar cells
  • Panchromatic absorption
  • Porphyrin acceptors

ASJC Scopus subject areas

  • Chemistry(all)


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