% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Smeets:172720,
      author       = {Smeets, Michael and Smirnov, Vladimir and Meier, Matthias
                      and Bittkau, Karsten and Carius, Reinhard and Rau, Uwe and
                      Paetzold, Ulrich W.},
      title        = {{O}n the geometry of plasmonic reflection grating back
                      contacts for light trapping in prototype amorphous silicon
                      thin-film solar cells},
      journal      = {Journal of photonics for energy},
      volume       = {5},
      number       = {1},
      issn         = {1947-7988},
      address      = {Bellingham Wash.},
      publisher    = {SPIE},
      reportid     = {FZJ-2014-06164},
      pages        = {057004},
      year         = {2015},
      abstract     = {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. These back contacts consist of
                      periodically arranged Ag nanostructures on flat Ag
                      reflectors. We vary the period, unit cell, and width of the
                      nanostructures to identify design strategies for optimized
                      light trapping. First, a general correlation between the
                      reduction of the period of the nanostructures down to 550 nm
                      and an increase of the absorptance, as well as external
                      quantum efficiency is found for various unit cells formed by
                      nanostructures. Second, increasing the width of the
                      nanostructures from 200 to 350 nm, an enhanced
                      light-trapping effect of the thin-film solar cells is found
                      independent of the period. As a result, we identify a design
                      for improved light trapping for the given solar cell
                      parameters within the considered variations. It consists of
                      thin-film solar cells applying a combination of a period of
                      600 nm and a structure width of 350 nm. The implementation
                      of back contacts with this configuration yields enhanced
                      power conversion efficiency as compared to reference solar
                      cells processed on conventionally used randomly textured
                      substrates. In detail, the enhancement of the short-circuit
                      current density from initially 14.7 to initially
                      15.6  mA/cm2 improves the power conversion efficiency
                      from 9.1 to $9.3\%.$},
      cin          = {IEK-5},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {121 - Solar cells of the next generation (POF3-121) / HITEC
                      - Helmholtz Interdisciplinary Doctoral Training in Energy
                      and Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-121 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000359851000001},
      doi          = {10.1117/1.JPE.5.057004},
      url          = {https://juser.fz-juelich.de/record/172720},
}