% 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”.

@INPROCEEDINGS{Paetzold:173099,
      author       = {Paetzold, Ulrich W. and Smeets, Michael and Lehnen, Stephan
                      and Bittkau, Karsten and Meier, Matthias and Smirnov,
                      Vladimir and Michaelis, Dirk and Waechter, Christoph and
                      Carius, Reinhard and Rau, Uwe},
      title        = {{L}ight {T}rapping with {W}aveguide {M}odes in
                      {P}eriodically {N}anostructured {T}hin-{F}ilm {S}ilicon
                      {S}olar {C}ells},
      reportid     = {FZJ-2014-06512},
      year         = {2014},
      abstract     = {Thin-film silicon solar cells offer the advantages of low
                      material and manufacturing costs. In order to enhance the
                      absorptance of incident light in the optically thin silicon
                      absorber layer, this technology requires advanced
                      light-trapping concepts. Conventional devices apply randomly
                      textured transparent conductive oxide substrates serving as
                      light-scattering front contacts as well as reflective
                      light-scattering metal back contacts. In recent years,
                      several novel light-trapping concepts based on periodic
                      nanostructures and periodically nanotextured interfaces,
                      such as grating couplers, photonic crystals or plasmonic
                      reflection gratings, have been suggested and prototyped. For
                      these concepts the absorption of incident light in the solar
                      cells is enhanced by light-coupling to waveguide modes which
                      are supported by the silicon absorber layer of the solar
                      cells but can be excited at the same time by incident
                      light.In this contribution, our recent progress on
                      light-trapping in periodically structured prototype
                      thin-film silicon solar cells made of hydrogenated amorphous
                      silicon and hydrogenated microcrystalline silicon is
                      presented. The prototype solar cells show a superior
                      light-trapping effect compared to solar cells applying the
                      conventional random texture for light-trapping. To better
                      understand this improved light-trapping effect, the coupling
                      of incident light to waveguide modes in periodically
                      nanostructured thin-film silicon solar cells is analysed
                      in-depth. Therefore, the shape of the grating structure and
                      the geometry of the unit cell of the two-dimensional
                      periodic grating structure of the thin-film silicon solar
                      cells are varied systematically and the excitation of the
                      waveguide modes is studied. To characterize the coupling of
                      incident light to individual waveguide modes, advanced
                      characterization techniques, i.e. angular and polarization
                      dependent spectral response measurements of resolution below
                      3 nm as well as near-field scanning optical microscopy, are
                      developed and employed. Finally, based on our study new
                      routes for improved designs of the periodic nanostructure of
                      thin-film silicon solar cells will be outlined.},
      month         = {Apr},
      date          = {2014-04-21},
      organization  = {MRS Spring Meeting, San Francisco
                       (USA), 21 Apr 2014 - 25 Apr 2014},
      subtyp        = {Invited},
      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/173099},
}