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@ARTICLE{Prochowicz:904112,
      author       = {Prochowicz, Daniel and Trivedi, Suverna and Parikh, Nishi
                      and Saliba, Michael and Kalam, Abul and Mahdi Tavakoli,
                      Mohammad and Yadav, Pankaj},
      title        = {{I}n the {Q}uest of {L}ow‐{F}requency {I}mpedance
                      {S}pectra of {E}fficient {P}erovskite {S}olar {C}ells},
      journal      = {Energy technology},
      volume       = {9},
      number       = {7},
      issn         = {2194-4288},
      address      = {Weinheim [u.a.]},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2021-05682},
      pages        = {2100229},
      year         = {2021},
      abstract     = {Measurement and understanding of electrochemical impedance
                      spectroscopy of perovskite solar cells (PSCs) are
                      nontrivial, as perovskite absorbers are a mixed conductor
                      exhibiting both ionic and electronic motion. Moreover, the
                      interpretation of the low-frequency spectra especially
                      low-frequency resistance (R LF) is ambiguous. Some reports
                      suggest that R LF is related to ionic transport resistance,
                      whereas others attribute it with the recombination
                      processes. Herein, more light is put on the quest of
                      low-frequency impedance spectra of efficient PSCs. It is
                      found that high- and low-frequency resistances (R HF and R
                      LF) follow a similar dependence on the applied bias and
                      illumination with a comparable slope. These resistances are
                      associated with the recombination processes in PSCs. The
                      relation between low-frequency spectra of PSCs and the
                      physical parameters such as the role of the interface,
                      grains’ sizes, and perovskite composition is studied. It
                      is found that the low-frequency spectra of PSCs mainly
                      depend on the grains’ sizes and shift toward the high
                      frequency, i.e., toward faster time constants with
                      increasing the grain size. It is observed that these devices
                      exhibit the lower recombination and higher open-circuit
                      voltage. A convenient way for the in-depth analysis of PSCs,
                      which will be crucial for designing better-performing PSCs,
                      is provided.},
      cin          = {IEK-5},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {1215 - Simulations, Theory, Optics, and Analytics (STOA)
                      (POF4-121)},
      pid          = {G:(DE-HGF)POF4-1215},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000655688100001},
      doi          = {10.1002/ente.202100229},
      url          = {https://juser.fz-juelich.de/record/904112},
}