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@ARTICLE{Alvarez:889136,
      author       = {Alvarez, Agustin O. and Arcas, Ramón and Aranda, Clara A.
                      and Bethencourt, Loengrid and Mas-Marzá, Elena and Saliba,
                      Michael and Fabregat-Santiago, Francisco},
      title        = {{N}egative {C}apacitance and {I}nverted {H}ysteresis:
                      {M}atching {F}eatures in {P}erovskite {S}olar {C}ells},
      journal      = {The journal of physical chemistry letters},
      volume       = {11},
      number       = {19},
      issn         = {1948-7185},
      address      = {Washington, DC},
      publisher    = {ACS},
      reportid     = {FZJ-2021-00061},
      pages        = {8417 - 8423},
      year         = {2020},
      abstract     = {Negative capacitance in the low-frequency domain and
                      inverted hysteresis are familiar features in perovskite
                      solar cells, which origin is still under discussion. Here we
                      use impedance spectroscopy to analyze these responses in
                      methylammonium lead bromide cells treated with lithium
                      cations at the electron-selective layer/perovskite interface
                      and in iodide devices exposed to different relative humidity
                      conditions. Employing the surface polarization model, we
                      obtain a time constant associated with the kinetics of the
                      interaction of ions/vacancies with the surface, τkin, in
                      the range of 100–102 s for all the cases exhibiting both
                      features. These interactions lead to a decrease in the
                      overall recombination resistance, modifying the
                      low-frequency perovskite response and yielding a flattening
                      of the cyclic voltammetry. As a consequence of these results
                      we find that negative capacitance and inverted hysteresis
                      lead to a decrease in the fill factor and photovoltage
                      values.},
      cin          = {IEK-5},
      ddc          = {530},
      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       = {32903005},
      UT           = {WOS:000577152900071},
      doi          = {10.1021/acs.jpclett.0c02331},
      url          = {https://juser.fz-juelich.de/record/889136},
}