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@ARTICLE{Tian:890144,
      author       = {Tian, Jingjing and Wang, Jing and Xue, Qifan and Niu,
                      Tianqi and Yan, Lei and Zhu, Zonglong and Li, Ning and
                      Brabec, Christoph J. and Yip, Hin-Lap and Cao, Yong},
      title        = {{C}omposition {E}ngineering of {A}ll‐{I}norganic
                      {P}erovskite {F}ilm for {E}fficient and {O}perationally
                      {S}table {S}olar {C}ells},
      journal      = {Advanced functional materials},
      volume       = {30},
      number       = {28},
      issn         = {1616-3028},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2021-00733},
      pages        = {2001764 -},
      year         = {2020},
      abstract     = {Cesium-based inorganic perovskites have recently attracted
                      great research focus due to their excellent optoelectronic
                      properties and thermal stability. However, the operational
                      instability of all-inorganic perovskites is still a main
                      hindrance for the commercialization. Herein, a facile
                      approach is reported to simultaneously enhance both the
                      efficiency and long-term stability for all-inorganic
                      CsPbI2.5Br0.5 perovskite solar cells via inducing excess
                      lead iodide (PbI2) into the precursors. Comprehensive film
                      and device characterizations are conducted to study the
                      influences of excess PbI2 on the crystal quality,
                      passivation effect, charge dynamics, and photovoltaic
                      performance. It is found that excess PbI2 improves the
                      crystallization process, producing high-quality
                      CsPbI2.5Br0.5 films with enlarged grain sizes, enhanced
                      crystal orientation, and unchanged phase composition. The
                      residual PbI2 at the grain boundaries also provides a
                      passivation effect, which improves the optoelectronic
                      properties and charge collection property in optimized
                      devices, leading to a power conversion efficiency up to
                      $17.1\%$ with a high open-circuit voltage of 1.25 V. More
                      importantly, a remarkable long-term operational stability is
                      also achieved for the optimized CsPbI2.5Br0.5 solar cells,
                      with less than $24\%$ degradation drop at the maximum power
                      point under continuous illumination for 420 h.},
      cin          = {IEK-11},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-11-20140314},
      pnm          = {121 - Solar cells of the next generation (POF3-121) / 540 -
                      Advanced Engineering Materials (POF3-500)},
      pid          = {G:(DE-HGF)POF3-121 / G:(DE-HGF)POF3-540},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000536917500001},
      doi          = {10.1002/adfm.202001764},
      url          = {https://juser.fz-juelich.de/record/890144},
}