Origin of poor photovoltaic performance of bis(tetracyanoantrathiophene) non-fullerene acceptor

E. S. Kobeleva, A. A. Popov, D. S. Baranov, M. N. Uvarov, D. A. Nevostruev, K. M. Degtyarenko, R. M. Gadirov, A. S. Sukhikh, L. V. Kulik

Research output: Contribution to journalArticlepeer-review

Abstract

Light-induced EPR and out-of-phase electron spin echo techniques were applied to identify the origin of low photovoltaic performance of novel non-fullerene antrathiophene-based acceptor 2,2′-[2,2′-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis(anthra[2,3-b]thiophene-5,10-diylidene)]tetrapropanedinitrile (AT1), compared to conventional fullerene acceptors. These techniques revealed that average trapping energy of electrons in PCDTBT/AT1 blend is higher than that in the blends of PCDTBT with fullerene acceptors, while the distance of the initial photo-induced electron transfer is decreased. These two effects are suggested to enhance the efficiency of geminate recombination in PCDTBT/AT1 blend and reduce the yield of free charges, which is supposed to be the main reason for poor OPV performance of AT1-containing blends. Low electron mobility μe = 3.5 *10-6 cm2V-1s−1 is estimated for AT1 from photo-CELIV experiment. Strong localization of the electrons on terminal acceptor units of AT1 consistently explains both efficient geminate recombination in blends of antrathiophene-based acceptor with polymer donors and low electron mobility in AT1.

Original languageEnglish
Article number111162
JournalChemical Physics
Volume546
DOIs
Publication statusPublished - 1 Jun 2021

Keywords

  • Electron spin echo
  • EPR spectroscopy
  • Fullerenes
  • Mobility
  • Organic photovoltaics
  • Recombination

OECD FOS+WOS

  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY
  • 1.04 CHEMICAL SCIENCES

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