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@ARTICLE{Almora:890999,
      author       = {Almora, Osbel and Cabrera, Carlos I. and Garcia-Cerrillo,
                      Jose and Kirchartz, Thomas and Rau, Uwe and Brabec,
                      Christoph J.},
      title        = {{Q}uantifying the {A}bsorption {O}nset in the {Q}uantum
                      {E}fficiency of {E}merging {P}hotovoltaic {D}evices},
      journal      = {Advanced energy materials},
      volume       = {11},
      number       = {16},
      issn         = {1614-6840},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2021-01306},
      pages        = {2100022},
      year         = {2021},
      abstract     = {The external quantum efficiency (EQE), also known as
                      incident‐photon‐to‐collected‐electron spectra are
                      typically used to access the energy dependent photocurrent
                      losses for photovoltaic devices. The integral over the EQE
                      spectrum results in the theoretical short‐circuit current
                      under a given incident illumination spectrum. Additionally,
                      one can also estimate the photovoltaic bandgap energy (Eg)
                      from the inflection point in the absorption threshold
                      region. The latter has recently been implemented in the
                      “Emerging PV reports,” where the highest power
                      conversion efficiencies are listed for different application
                      categories, as a function of Eg. Furthermore, the device
                      performance is put into perspective thereby relating it to
                      the corresponding theoretical limit in the
                      Shockley–Queisser (SQ) model. Here, the evaluation of the
                      EQE spectrum through the sigmoid function is discussed and
                      proven to effectively report the Eg value and the sigmoid
                      wavelength range λs, which quantifies the steepness of the
                      absorption onset. It is also shown how EQE spectra with
                      large λs indicate significant photovoltage losses and
                      present the corresponding implications on the photocurrent
                      SQ model. Similarly, the difference between the photovoltaic
                      and optical bandgap is analyzed in terms of λs.},
      cin          = {IEK-11 / IEK-5},
      ddc          = {050},
      cid          = {I:(DE-Juel1)IEK-11-20140314 / I:(DE-Juel1)IEK-5-20101013},
      pnm          = {121 - Photovoltaik und Windenergie (POF4-121)},
      pid          = {G:(DE-HGF)POF4-121},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000625673700001},
      doi          = {10.1002/aenm.202100022},
      url          = {https://juser.fz-juelich.de/record/890999},
}