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@INPROCEEDINGS{Hoffmann:173098,
      author       = {Hoffmann, Andre and Paetzold, Ulrich W. and Zhang, Chao and
                      Bittkau, Karsten and Rau, Uwe},
      title        = {{T}extured tandem solar cells with spectrally selective
                      multilayer intermediate reflectors},
      reportid     = {FZJ-2014-06511},
      year         = {2014},
      abstract     = {Tandem thin-film silicon solar cells consist of an
                      amorphous silicon top cell and a microcrystalline silicon
                      bottom cell which are stacked and connected in series. To
                      match the photocurrents of the top cell and the bottom cell,
                      a proper light management is essential. To this end,
                      intermediate reflectors are applied between the top and the
                      bottom solar cells. State-of-the-art single-layer
                      intermediate reflectors are made of low refractive index
                      materials but show poor spectral selectivity and cause
                      parasitic reflection losses in the external quantum
                      efficiency of the bottom cell. We report on the design of a
                      multilayer intermediate reflector based on aluminum doped
                      zinc oxide and microcrystalline silicon oxide with a
                      spectrally selective reflectance. Rigorous optical
                      simulations are used to examine the intermediate reflector
                      even in textured thin-film solar cells. In a subsequent
                      step, this intermediate reflector was successfully
                      integrated into state-of-the art tandem solar cells
                      deposited on a rough front contact. In agreement to
                      simulation, an improved spectral selective reflectance of
                      incident light is realized which increases the total charge
                      carrier generation of the tandem solar cell by 0.7 mA/cm²
                      in comparison to the state-of-the-art single-layer
                      intermediate reflector.},
      month         = {May},
      date          = {2014-05-26},
      organization  = {E-MRS Spring Meeting, Lille (France),
                       26 May 2014 - 30 May 2014},
      subtyp        = {Other},
      cin          = {IEK-5},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {111 - Thin Film Photovoltaics (POF2-111) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF2-111 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/173098},
}