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  • Lin, YuanbaoKing Abdullah University of Science and Technology (KAUST),University Of Oxford (author)

18.9% Efficient Organic Solar Cells Based on n-Doped Bulk-Heterojunction and Halogen-Substituted Self-Assembled Monolayers as Hole Extracting Interlayers

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022-10-03
  • Wiley,2022

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:2aca3f85-34fc-48f6-a15f-4c2b6e12d625
  • https://doi.org/10.1002/aenm.202202503DOI
  • https://research.chalmers.se/publication/532478URI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • The influence of halogen substitutions (F, Cl, Br, and I) on the energy levels of the self-assembled hole-extracting molecule [2-(9H-Carbazol-9-yl)ethyl]phosphonic acid (2PACz), is investigated. It is found that the formation of self-assembled monolayers (SAMs) of [2-(3,6-Difluoro-9H-carbazol-9-yl)ethyl]phosphonic acid (F-2PACz), [2-(3,6-Dichloro-9H-carbazol-9-yl)ethyl]phosphonic acid (Cl-2PACz), [2-(3,6-Dibromo-9H-carbazol-9-yl)ethyl]phosphonic acid (Br-2PACz), and [2-(3,6-Diiodo-9H-carbazol-9-yl)ethyl]phosphonic acid (I-2PACz) directly on indium tin oxide (ITO) increases its work function from 4.73 eV to 5.68, 5.77, 5.82, and 5.73 eV, respectively. Combining these ITO/SAM electrodes with the ternary bulk-heterojunction (BHJ) system PM6:PM7-Si:BTP-eC9 yields organic photovoltaic (OPV) cells with power conversion efficiency (PCE) in the range of 17.7%-18.5%. OPVs featuring Cl-2PACz SAMs yield the highest PCE of 18.5%, compared to cells with F-2PACz (17.7%), Br-2PACz (18.0%), or I-2PACz (18.2%). Data analysis reveals that the enhanced performance of Cl-2PACz-based OPVs relates to the increased hole mobility, decreased interface resistance, reduced carrier recombination, and longer carrier lifetime. Furthermore, OPVs featuring Cl-2PACz show enhanced stability under continuous illumination compared to ITO/PEDOT:PSS-based cells. Remarkably, the introduction of the n-dopant benzyl viologen into the BHJ further boosted the PCE of the ITO/Cl-2PACz cells to a maximum value of 18.9%, a record-breaking value for SAM-based OPVs and on par with the best-performing OPVs reported to date.

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  • Zhang, YadongUniversity of Colorado at Boulder,Georgia Institute of Technology (author)
  • Zhang, JunxiangGeorgia Institute of Technology,University of Colorado at Boulder (author)
  • Marcinskas, MantasKaunas University of Technology (author)
  • Malinauskas, TadasKaunas University of Technology (author)
  • Magomedov, ArtiomKaunas University of Technology (author)
  • Nugraha, Mohamad InsanKing Abdullah University of Science and Technology (KAUST),National Research & Innovation Agency (BRIN) (author)
  • Kaltsas, DimitrisNational Technical University of Athens (NTUA) (author)
  • Naphade, Dipti R.King Abdullah University of Science and Technology (KAUST) (author)
  • Harrison, George T.King Abdullah University of Science and Technology (KAUST) (author)
  • El-Labban, AbdulrahmanKing Abdullah University of Science and Technology (KAUST) (author)
  • Barlow, StephenGeorgia Institute of Technology,University of Colorado at Boulder (author)
  • De Wolf, StefaanKing Abdullah University of Science and Technology (KAUST) (author)
  • Wang, Ergang,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ergang (author)
  • McCulloch, IainKing Abdullah University of Science and Technology (KAUST),University Of Oxford (author)
  • Tsetseris, LeonidasNational Technical University of Athens (NTUA) (author)
  • Getautis, VytautasKaunas University of Technology (author)
  • Marder, Seth R.University of Colorado at Boulder,Georgia Institute of Technology (author)
  • Anthopoulos, Thomas D.King Abdullah University of Science and Technology (KAUST) (author)
  • King Abdullah University of Science and Technology (KAUST)University Of Oxford (creator_code:org_t)

Related titles

  • In:Advanced Energy Materials: Wiley12:451614-68401614-6832

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