% 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”.

@PHDTHESIS{Yin:1048442,
      author       = {Yin, Hao},
      othercontributors = {Kumpf, Christian and Mayer, Joachim},
      title        = {{I}nvestigation of 2{D} materials using low energy electron
                      microscopy ({LEEM})},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      publisher    = {RWTH Aachen University},
      reportid     = {FZJ-2025-04648},
      pages        = {pages 1 Online-Ressource : Illustrationen},
      year         = {2025},
      note         = {Dissertation, RWTH Aachen, 2025},
      abstract     = {Low-energy electron microscopy (LEEM) is a versatile and
                      powerful surface science tool for imaging, structural
                      analysis and the study of kinetic surface processes such as
                      molecular island growth, thin film growth and surface
                      reconstruction. It uses electrons with kinetic energies
                      below a few hundred electronvolts, often below 10 eV. In
                      this thesis, LEEM serves as the main technique to support
                      our research efforts in fabricating 30◦-twisted bilayer
                      graphene (TBG) and in studying the deposition and
                      degradation behavior of a cyclic, tire-shaped molecules on a
                      metal crystal. The first two topics of this thesis build on
                      previous work from our group that demonstrated the epitaxial
                      growth of unconventionally oriented monolayer graphene on a
                      6H-SiC(0001) substrate. In the first topic, LEEM and other
                      investigation methods were used to characterize the
                      morphology and electronic properties of such
                      unconventionally oriented monolayer graphene. The effect of
                      the preparation temperature on the resulting graphene sample
                      was highlighted. In the second topic, we achieved and
                      studied bilayer stacking and twist configurations of
                      graphene by hydrogen intercalation of the carbon buffer
                      layer, an intrinsic component between the epitaxial graphene
                      and the SiC substrate. Hydrogen atoms were successfully
                      introduced to decouple the buffer layer from the substrate.
                      The buffer layer was transformed into a true graphene layer
                      with distinct π-band properties. This intercalation process
                      was carried out in a stepwise manner, with LEEM being used
                      to study each step. The deintercalation process was
                      monitored in situ and in real time. This provided deeper
                      insights into the mechanisms of hydrogen intercalation and
                      deintercalation. In the third topic of the thesis, the
                      deposition behavior of a carbon-based cyclic aromatic
                      molecule, [6]-cycloparaphenylenes, is investigated using
                      LEEM in addition to pristine 2D graphene layers.
                      Interestingly, our observations contradict previous results
                      obtained by scanning tunneling microscopy. This provides new
                      insights into the deposition behavior of this type of
                      molecules on surfaces.},
      keywords     = {Hochschulschrift (Other) / twisted bilayer graphene (TBG) ;
                      unconventionally oriented epitaxial graphene ; low energy
                      electron microscopy (LEEM) ; hydrogene intercalation
                      (Other)},
      cin          = {PGI-3},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {5213 - Quantum Nanoscience (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5213},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2025-07835},
      url          = {https://juser.fz-juelich.de/record/1048442},
}