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@ARTICLE{Felter:863489,
author = {Felter, Janina and Raths, Miriam and Franke, Markus and
Kumpf, Christian},
title = {{I}n-situ study of two-dimensional dendritic growth of
hexagonal boron nitride},
journal = {2D Materials},
volume = {6},
number = {4},
issn = {2053-1583},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {FZJ-2019-03543},
pages = {045005},
year = {2019},
abstract = {Hexagonal boron nitride, often entitled the "white
graphene" because of its large band gap, is one of the most
important two-dimensional (2D) materials and frequently
investigated in context with stacked arrays of single 2D
layers, so called van der Waals heterostructures. Here, we
concentrate on the growth of hBN on the coinage metal
surface Cu(111). Using low energy electron microscopy and
diffraction, we investigate the self-terminated growth of
the first layer in-situ and in real time. Most prominently,
we find dendritic structures with three strongly preferred
growth branches that are mostly well aligned with the
Cu(111) substrate and exhibit a three-fold symmetric shape.
The observation of dendritic structures is very surprising
since hBN was found to grow in compact, triangular-shaped
islands on many other metal substrates, in particular, on
transition metal surfaces where it shows a much stronger
interaction to the surface. We explain the unexpected
dendritic growth by an asymmetry of the bonding energy for
the two possible ways a borazine molecule can attach to an
existing hBN island, namely either with one of its boron or
one of its nitrogen atoms. We suggest that this asymmetry
originates from different dehydrogenation states of the
adsorbed borazine molecules and the hBN islands. We call
this mechanism "Dehydrogenation Limited Aggregation'' since
it is generic in the sense that it is merely based on
different dehydrogenation energies for the involved building
blocks forming the 2D layer.},
cin = {PGI-3},
ddc = {530},
cid = {I:(DE-Juel1)PGI-3-20110106},
pnm = {141 - Controlling Electron Charge-Based Phenomena
(POF3-141)},
pid = {G:(DE-HGF)POF3-141},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000476954200005},
doi = {10.1088/2053-1583/ab2926},
url = {https://juser.fz-juelich.de/record/863489},
}