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@ARTICLE{Kirchartz:888751,
      author       = {Kirchartz, Thomas and Cahen, David},
      title        = {{M}inimum doping densities for p–n junctions},
      journal      = {Nature energy},
      volume       = {5},
      issn         = {2058-7546},
      address      = {London},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2020-05180},
      pages        = {973–975},
      year         = {2020},
      abstract     = {In their Article, Cui et al.1 describe the fabrication and
                      characterization of planar p–n junction solar cells based
                      on lead-halide perovskites. The formation of a p–n
                      junction is noteworthy given the doping densities, measured
                      using the Hall effect, which were reported to vary from
                      ND = 1 × 1012 cm−3 to 8 × 1012 cm−3
                      for the solution-processed n-type layer and to equal
                      NA = 8 × 109 cm−3 for the evaporated p-type
                      layer. Although these devices outperform their counterparts
                      that are supposedly undoped, the results raise three
                      important questions. Are the reported doping densities high
                      enough to change the electrostatic potential distribution in
                      the device from that of undoped ones? Are the doping
                      densities high enough for the p–n junction to remain
                      intact under typical photovoltaic operation conditions? Is a
                      p–n junction beneficial for photovoltaic performance given
                      the typical properties of lead-halide perovskites.},
      cin          = {IEK-5},
      ddc          = {330},
      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},
      UT           = {WOS:000584361800003},
      doi          = {10.1038/s41560-020-00708-2},
      url          = {https://juser.fz-juelich.de/record/888751},
}