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@ARTICLE{Zhao:903920,
      author       = {Zhao, Yicheng and Heumueller, Thomas and Zhang, Jiyun and
                      Luo, Junsheng and Kasian, Olga and Langner, Stefan and
                      Kupfer, Christian and Liu, Bowen and Zhong, Yu and Elia,
                      Jack and Osvet, Andres and Wu, Jianchang and Liu, Chao and
                      Wan, Zhongquan and Jia, Chunyang and Li, Ning and Hauch,
                      Jens and Brabec, Christoph J.},
      title        = {{A} bilayer conducting polymer structure for planar
                      perovskite solar cells with over 1,400 hours operational
                      stability at elevated temperatures},
      journal      = {Nature energy},
      volume       = {7},
      issn         = {2058-7546},
      address      = {London},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2021-05544},
      pages        = {144-152},
      year         = {2022},
      abstract     = {The long-term stability of perovskite solar cells remains a
                      challenge. Both the perovskite layer and the device
                      architecture need to endure long-term operation. Here we
                      first use a self-constructed high-throughput screening
                      platform to find perovskite compositions stable under heat
                      and light. Then, we use the most stable perovskite
                      composition to investigate the stability of contact layers
                      in solar cells. We report on the thermal degradation
                      mechanism of transition metal oxide contact (for example,
                      Ta-WOx/NiOx) and propose a bilayer structure consisting of
                      acid-doped polymer stacked on dopant-free polymer as an
                      alternative. The dopant-free polymer provides an acid
                      barrier between the perovskite and the acid-doped polymer.
                      The bilayer structure exhibits stable ohmic contact at
                      elevated temperatures and buffers iodine vapours. The
                      unencapsulated device based on the bilayer contact (with a
                      MgF2 capping layer) retains $99\%$ of its peak efficiency
                      after 1,450 h of continuous operation at 65 °C in a N2
                      atmosphere under metal-halide lamps. The device also shows
                      negligible hysteresis during the entire ageing period.},
      cin          = {IEK-11},
      ddc          = {330},
      cid          = {I:(DE-Juel1)IEK-11-20140314},
      pnm          = {1212 - Materials and Interfaces (POF4-121) / 1213 - Cell
                      Design and Development (POF4-121)},
      pid          = {G:(DE-HGF)POF4-1212 / G:(DE-HGF)POF4-1213},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000730887700002},
      doi          = {10.1038/s41560-021-00953-z},
      url          = {https://juser.fz-juelich.de/record/903920},
}