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@ARTICLE{Schumann:256188,
      author       = {Schumann, Martin F. and Wiesendanger, Samuel and
                      Goldschmidt, Jan Christoph and Bläsi, Benedikt and Bittkau,
                      Karsten and Paetzold, Ulrich W. and Sprafke, Alexander and
                      Wehrspohn, Ralf B. and Rockstuhl, Carsten and Wegener,
                      Martin},
      title        = {{C}loaked contact grids on solar cells by coordinate
                      transformations: designs and prototypes},
      journal      = {Optica},
      volume       = {2},
      number       = {10},
      issn         = {2334-2536},
      address      = {Washington, DC},
      publisher    = {OSA},
      reportid     = {FZJ-2015-06172},
      pages        = {850-853},
      year         = {2015},
      abstract     = {Nontransparent contact fingers on the sun-facing side of
                      solar cells represent optically dead regions which reduce
                      the energy conversion per area. We consider two approaches
                      for guiding the incident light around the contacts onto the
                      active area. The first approach uses graded-index
                      metamaterials designed by two-dimensional
                      Schwarz–Christoffel conformal maps, and the second uses
                      freeform surfaces designed by one-dimensional coordinate
                      transformations of a point to an interval. We provide
                      proof-of-principle demonstrators using direct laser writing
                      of polymer structures on silicon wafers with opaque
                      contacts. Freeform surfaces are amenable to mass fabrication
                      and allow for complete recovery of the shadowing effect for
                      all relevant incidence angles.},
      cin          = {IEK-5},
      ddc          = {530},
      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:000364485100004},
      doi          = {10.1364/OPTICA.2.000850},
      url          = {https://juser.fz-juelich.de/record/256188},
}