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@ARTICLE{Tian:910458,
      author       = {Tian, Jingjing and Zhang, Kaicheng and Xie, Zhiqiang and
                      Peng, Zijian and Zhang, Jiyun and Osvet, Andres and Lüer,
                      Larry and Kirchartz, Thomas and Rau, Uwe and Li, Ning and
                      Brabec, Christoph J.},
      title        = {{Q}uantifying the {E}nergy {L}osses in {C}s{P}b{I} 2 {B}r
                      {P}erovskite {S}olar {C}ells with an {O}pen-{C}ircuit
                      {V}oltage of up to 1.45 {V}},
      journal      = {ACS energy letters},
      volume       = {7},
      issn         = {2380-8195},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2022-03847},
      pages        = {4071 - 4080},
      year         = {2022},
      abstract     = {CsPbI2Br perovskite solar cells (PSCs) have attracted
                      muchinterest because of their thermodynamic stability,
                      relatively stable cubicperovskite phase, and their potential
                      as a top cell for tandem applications.However, the
                      open-circuit voltage (VOC) reported to date is in most cases
                      wellbelow the detailed balance (DB) limit for
                      single-junction PSCs. Here, wedemonstrate that adding lead
                      acetate to the CsPbI2Br precursor allows us tosubstantially
                      reduce losses due to nonradiative recombination.
                      Correspondingchampion devices reach a power conversion
                      efficiency (η) of $16.7\%$ and ahighest VOC value of 1.45
                      V, which represents $90\%$ of the DB limit for
                      singlejunctionPSCs at a bandgap of 1.89 eV. In order to
                      disentangle thenonradiative recombination loss mechanisms,
                      we quantify the origin of energylosses by calculating the
                      radiative limit of the open-circuit voltage (VOCrad) andthe
                      quasi-Fermi level splitting (QFLS) of perovskite films with
                      and withoutother functional layers. We further analyze the
                      strategies to reduce the residual losses in order to push
                      the efficiency beyond the $90\%$ theoretical limit.},
      cin          = {IEK-5 / IEK-11},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IEK-5-20101013 / I:(DE-Juel1)IEK-11-20140314},
      pnm          = {1213 - Cell Design and Development (POF4-121) / 1212 -
                      Materials and Interfaces (POF4-121)},
      pid          = {G:(DE-HGF)POF4-1213 / G:(DE-HGF)POF4-1212},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000898398900001},
      doi          = {10.1021/acsenergylett.2c01883},
      url          = {https://juser.fz-juelich.de/record/910458},
}