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@ARTICLE{nl:877887,
      author       = {Ünlü, Feray and Jung, Eunhwan and Haddad, Jinane and
                      Kulkarni, Ashish and Öz, Senol and Choi, Heechae and
                      Fischer, Thomas and Chakraborty, Sudip and Kirchartz, Thomas
                      and Mathur, Sanjay},
      title        = {{U}nderstanding the interplay of stability and efficiency
                      in {A}-site engineered lead halide perovskites},
      journal      = {APL materials},
      volume       = {8},
      number       = {7},
      issn         = {2166-532X},
      address      = {Melville, NY},
      publisher    = {AIP Publ.},
      reportid     = {FZJ-2020-02492},
      pages        = {070901},
      year         = {2020},
      abstract     = {Organic–inorganic hybrid lead halide perovskites have
                      gained significant attention as light-harvesting materials
                      in thin-film photovoltaics due to their exceptional
                      optoelectronic properties and simple fabrication process.
                      The power conversion efficiency of perovskite solar cells
                      (PSCs) has surged beyond $25\%$ in a short time span. Their
                      transition to commercial market is a “work in progress”
                      due to limited long-term operational stability and the
                      persisting environmental concern due to the presence of
                      lead. Comprehensive investigations on the interplay of
                      material composition and interfacial effects on the device
                      performance of PSCs based on methylammonium lead iodide have
                      shown the crucial role of an A-site cation in incipient
                      deterioration of the material through external stimuli
                      (moisture, light, oxygen, or heat). Consequently, a partial
                      or complete replacement of A-site cations by up to four
                      isoelectronic substituents has resulted in many new
                      perovskite compositions. The correlations between the
                      chemical composition and the optoelectronic properties are,
                      however, not always easy to determine. A-site cation
                      management is governed by stability and charge neutrality of
                      the lattice, and the choices include Cs+-cations and organic
                      cations such as CH3NH3+ or CH(NH2)2+ and combinations
                      thereof. Since the size of the cations is an important
                      structural parameter, an adequate compositional engineering
                      of the A-site could effectively optimize the stability by
                      reducing non-radiative defect sites and enhancing carrier
                      lifetimes. This Perspective reflects on the experimental
                      strategies for A-site cation management and their direct
                      impact on the stability and device performance. It also
                      highlights the opportunities and challenges for further
                      research and industrial commercialization of
                      PSCs.INTRODUCTION},
      cin          = {IEK-5},
      ddc          = {600},
      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},
      UT           = {WOS:000546343400001},
      doi          = {10.1063/5.0011851},
      url          = {https://juser.fz-juelich.de/record/877887},
}