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@ARTICLE{Liu:890726,
      author       = {Liu, Zhifa and Siekmann, Johanna and Klingebiel, Benjamin
                      and Rau, Uwe and Kirchartz, Thomas},
      title        = {{I}nterface {O}ptimization via {F}ullerene {B}lends
                      {E}nables {O}pen-{C}ircuit {V}oltages of 1.35 {V} in
                      {CH}3{NH}3{P}b({I}0.8{B}r0.2)3 {S}olar {C}ells},
      journal      = {Advanced energy materials},
      volume       = {11},
      number       = {16},
      issn         = {1614-6832},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2021-01149},
      pages        = {2003386},
      year         = {2021},
      abstract     = {Nonradiative recombination processes are the biggest
                      hindrance to approaching the radiative limit of the
                      open‐circuit voltage for wide bandgap perovskite solar
                      cells. In addition to high bulk quality, good interfaces and
                      good energy level alignment for majority carriers at charge
                      transport layer‐absorber interfaces are crucial to
                      minimize nonradiative recombination pathways. By tuning the
                      lowest‐unoccupied molecular‐orbital of electron
                      transport layers via the use of different fullerenes and
                      fullerene blends, open‐circuit voltages exceeding 1.35 V
                      in CH3NH3Pb(I0.8Br0.2)3 device are demonstrated. Further
                      optimization of mobility in binary fullerenes electron
                      transport layers can boost the power conversion efficiency
                      as high as $18.9\%.$ It is noted in particular that the Voc
                      fill factor product is >1.096 V, which is the highest value
                      reported for halide perovskites with this bandgap.},
      cin          = {IEK-5},
      ddc          = {050},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {121 - Photovoltaik und Windenergie (POF4-121)},
      pid          = {G:(DE-HGF)POF4-121},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000627073600001},
      doi          = {10.1002/aenm.202003386},
      url          = {https://juser.fz-juelich.de/record/890726},
}