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@PHDTHESIS{Huhn:858032,
      author       = {male},
      title        = {{Q}uantitative {L}uminescence {I}maging of {S}olar {C}ells},
      volume       = {439},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2018-06976},
      isbn         = {978-3-95806-363-1},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {153 S., Anh.},
      year         = {2018},
      note         = {RWTH Aachen, Diss., 2018},
      abstract     = {Solar energy has the potential to provide clean and
                      sustainable energy to all of human kind and during the past
                      years the amount of operating solar power plants constantly
                      increased. The increasing installation and production
                      volumes call for powerful measuring techniques for the
                      process control of solar cell production lines, but also for
                      the monitoring of modules operating in solar power plants.
                      Luminescence imaging of solar cells and modules is such a
                      measuring technique. By observing the radiative
                      recombination that is emitted by a solar cell, just like the
                      light emission of LEDs, luminescence imaging provides
                      spatially resolved information about a solar cells
                      electrical and optical properties. Therefore, luminescence
                      imaging has the ability to locate and rate defects and
                      inhomogeneities insolar cells. This thesis focuses on the
                      use of luminescence imaging for quantitative evaluations.
                      Hence, it is not only looked at the ability of luminescence
                      imaging to locate abnormalities in solar cells or modules
                      but also on possibilities to use luminescence imaging as a
                      way to quantify the strength of a defect or to estimate the
                      inuence of a defect on the photovoltaic performance of a
                      whole device. During this work it was made use of two model
                      solar cell technologies. Crystalline silicon solar cells are
                      currently the most successful solar cell technology for
                      which luminescence imaging is already a well established
                      tool. This technology isprimarily used in this thesis to
                      test newly developed imaging methods. However, the focus of
                      this thesis lies on the analysis of the so called CIGS solar
                      cells and modules, which belong to the thin-lm technologies.
                      Although the market share of the thin-lm technologies was
                      only 5 $\%$ of the produced solar cells in 2016 their
                      production volumes are constantly increasing. To allow for a
                      quantitative evaluation of luminescence images of CIGS
                      solarcells it is first essential to understand the inuence
                      of metastable effects in this technology. Metastable effects
                      alter the properties of CIGS solar cells, including the
                      luminescence signal, during the exciation with illumination
                      or the application of bias. An in depth analysis of the
                      metastable effects at different applied currents and
                      temperatures showed that the metastable effects lead in most
                      cases to a reduction of the series resistance and dark
                      recombination current in CIGS solar cells. The changes vary
                      in magnitude for the different conditions and may happen
                      within a matter of seconds. However, a stabilization of the
                      solar cells can only be reached after a constant excitation
                      of several hours. This knowledge is essential for an
                      accurate quantitative evaluation of luminescence images. In
                      this work, an influence of metastable effects on the results
                      were avoided by automation and combining image data only
                      with electrical data measured simultaneously.},
      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)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2018120731},
      url          = {https://juser.fz-juelich.de/record/858032},
}