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@ARTICLE{Stolterfoht:874536,
      author       = {Stolterfoht, Martin and Grischek, Max and Caprioglio,
                      Pietro and Wolff, Christian M. and Gutierrez‐Partida,
                      Emilio and Peña‐Camargo, Francisco and Rothhardt, Daniel
                      and Zhang, Shanshan and Raoufi, Meysam and Wolansky, Jakob
                      and Abdi‐Jalebi, Mojtaba and Stranks, Samuel D. and
                      Albrecht, Steve and Kirchartz, Thomas and Neher, Dieter},
      title        = {{H}ow {T}o {Q}uantify the {E}fficiency {P}otential of
                      {N}eat {P}erovskite {F}ilms: {P}erovskite {S}emiconductors
                      with an {I}mplied {E}fficiency {E}xceeding $28\%$},
      journal      = {Advanced materials},
      volume       = {32},
      number       = {17},
      issn         = {1521-4095},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2020-01492},
      pages        = {2000080},
      year         = {2020},
      abstract     = {Perovskite photovoltaic (PV) cells have demonstrated power
                      conversion efficiencies (PCE) that are close to those of
                      monocrystalline silicon cells; however, in contrast to
                      silicon PV, perovskites are not limited by Auger
                      recombination under 1‐sun illumination. Nevertheless,
                      compared to GaAs and monocrystalline silicon PV, perovskite
                      cells have significantly lower fill factors due to a
                      combination of resistive and non‐radiative recombination
                      losses. This necessitates a deeper understanding of the
                      underlying loss mechanisms and in particular the ideality
                      factor of the cell. By measuring the intensity dependence of
                      the external open‐circuit voltage and the internal
                      quasi‐Fermi level splitting (QFLS), the transport
                      resistance‐free efficiency of the complete cell as well as
                      the efficiency potential of any neat perovskite film with or
                      without attached transport layers are quantified. Moreover,
                      intensity‐dependent QFLS measurements on different
                      perovskite compositions allows for disentangling of the
                      impact of the interfaces and the perovskite surface on the
                      non‐radiative fill factor and open‐circuit voltage loss.
                      It is found that potassium‐passivated triple cation
                      perovskite films stand out by their exceptionally high
                      implied PCEs > $28\%,$ which could be achieved with ideal
                      transport layers. Finally, strategies are presented to
                      reduce both the ideality factor and transport losses to push
                      the efficiency to the thermodynamic limit.},
      cin          = {IEK-5},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {121 - Solar cells of the next generation (POF3-121)},
      pid          = {G:(DE-HGF)POF3-121},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:32163652},
      UT           = {WOS:000530300000026},
      doi          = {10.1002/adma.202000080},
      url          = {https://juser.fz-juelich.de/record/874536},
}