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@ARTICLE{Ritter:442178,
      author       = {Ritter, Konrad and Eckner, Stefanie and Preiß, Cora and
                      Gurieva, Galina and Bischoff, Thomas and Welter, Edmund and
                      Botti, Silvana and Schorr, Susan and Schnohr, Claudia},
      title        = {{A}tomic scale structure and its impact on the band gap
                      energy for {C}u$_{2}${Z}n({S}n,{G}e){S}e$_{4}$ kesterite
                      alloys},
      journal      = {JPhys energy},
      volume       = {2},
      number       = {3},
      issn         = {2515-7655},
      address      = {Bristol},
      publisher    = {IOP Publishing},
      reportid     = {PUBDB-2020-02921},
      pages        = {035004: 1-9},
      year         = {2020},
      abstract     = {Kesterite based materials gain more and more relevance in
                      the pursuit of affordable, efficient and flexible absorber
                      materials for thin film photovoltaics. Alloying
                      Cu$_{2}$ZnSnSe$_{4}$ with Ge could allow controlled band gap
                      engineering as already established for Cu(In,Ga)(S,Se)$_{2}$
                      based solar cells. This study investigates the local atomic
                      arrangements of Cu$_{2}$Zn(Sn,Ge)Se$_{4}$ alloys by means of
                      low temperature Extended x-ray Absorbtion Fine Structure
                      Spectroscopy. The element specific bond lengths are used
                      together with x-ray diffraction data to derive the anion
                      positions of the different local configurations. Ab initio
                      theoretical calculations are performed to predict the
                      influence of structural parameters such as anion position
                      and lattice constants on the band gap energy. Combining the
                      results of the experimental and theoretical studies suggests
                      that the overall influence of the structural changes on the
                      band gap bowing due to alloying is significant yet smaller
                      than the total non-linear change of the band gap energy.
                      Consequently, it is concluded, that band gap bowing stems
                      from both structural and electronic changes.},
      cin          = {DOOR ; HAS-User / FS-PET-S},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G3 - PETRA III (POF3-622) /
                      FS-Proposal: I-20160075 (I-20160075)},
      pid          = {G:(DE-HGF)POF3-6213 / G:(DE-HGF)POF3-6G3 /
                      G:(DE-H253)I-20160075},
      experiment   = {EXP:(DE-H253)P-P65-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000569866800001},
      doi          = {10.1088/2515-7655/ab9d8b},
      url          = {https://bib-pubdb1.desy.de/record/442178},
}