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@INPROCEEDINGS{Rau:889170,
      author       = {Rau, Uwe},
      title        = {{P}hotovoltaic performance of metal-halide perovskites –
                      what is general and what is special?},
      reportid     = {FZJ-2021-00093},
      year         = {2020},
      abstract     = {After many decades of photovoltaic research we would expect
                      that there should be a common scientific understanding on
                      the necessary ingredients to make almost perfect solar
                      cells. However, the unprecedented success of metal-halide
                      perovskites (MHPs) stimulated discussions on whether there
                      could be a certain, yet non-established secret that
                      distinguishes this material from others. The present
                      contribution compares the performance of MHPs to other
                      photovoltaic materials in terms of a general top-down
                      approach. This direct comparison allows one to judge the
                      strengths and weaknesses of different technologies but also
                      gives some insight on the specific achievements, e.g. that,
                      on the one hand, the radiative yield of MHPs is second only
                      to the best GaAs solar cells, which implies open circuit
                      voltages that come close to the thermodynamic limits. On the
                      other hand the relative contribution of fill factor losses
                      to the overall efficiency losses in MHPs is relatively large
                      compared to most other technologies. Fill factor issues can
                      generally originate from recombination or voltage losses
                      during charge carrier collection, both aspects playing a
                      role for MHPs. This issue will be discussed in terms of new,
                      general models for the charge carrier separation in solar
                      cells. Finally, the question will be addressed whether
                      specific bulk properties of MHPs, like the presence of an
                      indirect band gap, the density of states, or small phonon
                      energies could be of importance for their favorable
                      photovoltaic behavior.},
      month         = {Nov},
      date          = {2020-11-27},
      organization  = {2020 MRS Virtual Spring/Fall Meeting
                       $\&$ Exhibit, virtual (USA), 27 Nov
                       2020 - 4 Dec 2020},
      subtyp        = {Invited},
      cin          = {IEK-5},
      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)6},
      url          = {https://juser.fz-juelich.de/record/889170},
}