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@ARTICLE{OchoaMartinez:904109,
      author       = {Ochoa-Martinez, Efrain and Ochoa, Mario and Ortuso, Roberto
                      D. and Ferdowsi, Parnian and Carron, Romain and Tiwari,
                      Ayodhya N. and Steiner, Ullrich and Saliba, Michael},
      title        = {{P}hysical {P}assivation of {G}rain {B}oundaries and
                      {D}efects in {P}erovskite {S}olar {C}ells by an {I}solating
                      {T}hin {P}olymer},
      journal      = {ACS energy letters},
      volume       = {6},
      number       = {7},
      issn         = {2380-8195},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2021-05679},
      pages        = {2626 - 2634},
      year         = {2021},
      abstract     = {Passivation and interlayer engineering are important
                      approaches to increase the efficiency and stability of
                      perovskite solar cells. Thin insulating dielectric films at
                      the interface between the perovskite and the charge carrier
                      transport layers have been suggested to passivate surface
                      defects. Here, we analyze the effect of depositing
                      poly(methyl methacrylate) (PMMA) from a very
                      low-concentration solution. Spatial- and time-resolved
                      photoluminescence and atomic force microscopy analyses of
                      samples with diverse morphologies demonstrate the
                      preferential deposition of PMMA in topographic depressions
                      of the perovskite layer, such as grain and domain
                      boundaries. This treatment results in an increase in the
                      fill factor of more than $4\%$ and an absolute efficiency
                      boost exceeding $1\%,$ with a maximum efficiency of
                      $20.4\%.$ Based on these results, we propose a physical
                      isolation mechanism rather than a chemical passivation of
                      perovskite defects, which explains not only the data of this
                      study but also most results found in earlier works.},
      cin          = {IEK-5},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {1212 - Materials and Interfaces (POF4-121)},
      pid          = {G:(DE-HGF)POF4-1212},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000672746800032},
      doi          = {10.1021/acsenergylett.1c01187},
      url          = {https://juser.fz-juelich.de/record/904109},
}