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@ARTICLE{Xu:909653,
      author       = {Xu, Zhenhua and Zeng, Linxiang and Hu, Jinlong and Wang,
                      Zhenya and Zhang, Putao and Brabec, Christoph and Forberich,
                      Karen and Mai, Yaohua and Guo, Fei},
      title        = {{R}educing energy barrier of δ-to-α phase transition for
                      printed formamidinium lead iodide photovoltaic devices},
      journal      = {Nano energy},
      volume       = {91},
      issn         = {2211-2855},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2022-03321},
      pages        = {106658 -},
      year         = {2022},
      abstract     = {Recent progress in perovskite photovoltaics has witnessed a
                      growing interest in formamidinium lead iodide (FAPbI3),
                      primarily due to its high efficiency potential and excellent
                      stability. However, the high energy barrier of δ-to-α
                      phase transition presents a major hurdle to fabricate
                      phase-pure α-FAPbI3 layers. Here, we report a two-step
                      phase transition process to deposit high-quality
                      photovoltaic α-FAPbI3 films by printing method. This is
                      realized by judicious selection of a Lewis base
                      N-methyl-2-pyrrolidone (NMP) and its counter Lewis acid,
                      which enables the regulation of intermediary phase to reduce
                      the energy barrier. With fine tuning the phase transition
                      pathway, phase-pure and stable α-FAPbI3 perovskite films
                      are obtained, which yield solar devices with a champion
                      efficiency of $21.35\%.$ The printed mini-modules with
                      active areas of 12.32 cm2 and 55.44 cm2 are also fabricated,
                      giving efficiencies of $17.07\%$ and $14.17\%,$
                      respectively. This work provides new insights of α-FAPbI3
                      crystallization for constructing efficient and stable
                      printed photovoltaic devices.},
      cin          = {IEK-11},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-11-20140314},
      pnm          = {1212 - Materials and Interfaces (POF4-121)},
      pid          = {G:(DE-HGF)POF4-1212},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000717768500005},
      doi          = {10.1016/j.nanoen.2021.106658},
      url          = {https://juser.fz-juelich.de/record/909653},
}