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@PHDTHESIS{Ermes:281955,
      author       = {Ermes, Markus},
      title        = {{O}ptical near-field investigations of photonic structures
                      for application in silicon-based thin-film solar cells},
      volume       = {299},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2016-01599},
      isbn         = {978-3-95806-108-8},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {vi, 157 S.},
      year         = {2015},
      note         = {RWTH Aachen, Diss., 2015},
      abstract     = {In this thesis, light scattering and propagation inside a
                      silicon-based thin-film solar cell is investigated using
                      optical simulations based on the finite-difference
                      time-domain method. The special focus in this thesis lies in
                      the analysis of the influence of randomly textured surfaces
                      on cell performance. Due to the random nature of these
                      structures and their varying sizes, simulation domains have
                      to be sufficiently large to have a statistically significant
                      distribution of features. The investigations focus on three
                      different areas: The first area is light scattering at
                      different interfaces in transmission as well as reflection.
                      These simulations are compared to results from an improved
                      scalar scattering model proposed by Domin´e et al. [J.
                      Appl. Phys. 107, p. 044504, 2010]. The agreementof both
                      methods is very good, with the limits of the scalar model
                      lyingin multiple interfaces and layers with a thickness
                      below the peak-to-peak roughness of the surface. Secondly,
                      the absorptance inside different hydrogenated amorphous and
                      microcrystalline silicon layers is investigated for
                      different structures; these include comparisons between
                      conformal surfaces and surfaces as obtained in real devices
                      by silicon growth. Further investigations in this area
                      included simple stretching of the surfaces along different
                      axes, as well as more complex modifications based on the
                      scalar scattering theory; additionally, an
                      amorphous/microcrystalline silicon solar cell is simulated
                      and compared to experimental results to find limitations in
                      the simulation approach. All of these simulations show a
                      better performance for steeper features with a lateral size
                      of about 500 nm. Additionally, the changes in topograhpy
                      introduced by the silicon growth has a significant impact on
                      cell performance. The last part of this thesis compares
                      optical simulations to measurements of a scanning near-field
                      optical microscope (SNOM). When comparing simulated
                      intensities directly above a rough surface to measurements,
                      it is found that the offset of the tip due to its finite
                      physical size is the strongest influence, while light
                      scattering at the tip has very little impact on (relative)
                      intensity measurements.},
      cin          = {IEK-5},
      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)11 / PUB:(DE-HGF)3},
      urn          = {urn:nbn:de:0001-2016022955},
      url          = {https://juser.fz-juelich.de/record/281955},
}