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@INPROCEEDINGS{Smeets:153689,
      author       = {Smeets, Michael and Smirnov, Vladimir and Meier, Matthias
                      and Bittkau, Karsten and Carius, Reinhard and Rau, Uwe and
                      Paetzold, Ulrich W.},
      title        = {{O}ptimizing the geometry of plasmonic reflection grating
                      back contacts for improved light trapping in prototype
                      amorphous silicon thin-film solar cells},
      volume       = {9140},
      reportid     = {FZJ-2014-03189},
      pages        = {91400D},
      year         = {2014},
      comment      = {Proceedings of SPIE},
      booktitle     = {Proceedings of SPIE},
      abstract     = {In this study, we experimentally investigate the
                      light-trapping effect of plasmonic reflection grating back
                      contacts in prototype hydrogenated amorphous silicon
                      thin-film solar cells in substrate configuration. The
                      plasmonic reflection grating back contacts consist of
                      periodically arranged Ag nanostructures on flat Ag
                      reflectors. By varying the geometrical parameters of these
                      back contacts, design strategies for optimized light
                      trapping are identified. First, a general correlation
                      between a reduction of the period of the plasmonic
                      reflection grating back contact and an increase of the
                      absorptance as well as external quantum efficiency is found
                      for various unit cells of the nanostructures i.e. square
                      unit cell, hexagonal unit cell and face-centered unit cell.
                      Second, the width of the nanostructures is varied. With
                      increasing width, an enhanced light-trapping effect of the
                      thin-film solar cells is found independent of the period. As
                      a result, an optimized design for improved light trapping in
                      the studied thin-film solar cells is a combination of a
                      period of 600 nm and a structure width of 350 nm. Solar
                      cells fabricated on plasmonic reflection grating back
                      contacts with this optimized configuration yield enhanced
                      power conversion efficiencies as compared to reference solar
                      cells processed on state-of-the-art randomly textured
                      substrates. In detail, the power conversion efficiency is
                      enhanced by around 0.2 $\%$ from 9.1 $\%$ to 9.3 $\%.$ This
                      increase is largely due to the enhancement of the
                      short-circuit current density of around 7 $\%$ from 14.7
                      mA/cm2 to 15.6 mA/cm2.},
      month         = {Apr},
      date          = {2014-04-14},
      organization  = {SPIE Photonics Europe, Brussels
                       (Belgium), 14 Apr 2014 - 17 Apr 2014},
      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)8 / PUB:(DE-HGF)7},
      UT           = {WOS:000339320100007},
      doi          = {10.1117/12.2052330},
      url          = {https://juser.fz-juelich.de/record/153689},
}