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Improved hBN Single-Crystal Growth by Adding Carbon in the Metal Flux
journal contribution
posted on 2019-10-18, 10:43 authored by Si-Yuan Zhang, Kang Xu, Xiao-Kang Zhao, Zhi-Yong Shao, Neng WanHigh-yield
growth of large-sized single-crystal hexagonal boron
nitride (hBN) bulk is receiving growing research interest due to its
graphene-like two-dimensional structure while having distinct electrical
and optical properties. In this study, enhanced yield and domain size
were realized by adding carbon into the metal flux system (Ni–Cr)
under atmospheric pressure. We found that both the yield and domain
size increased more than 10 times in optimized carbon amount when
compared with metal flux without carbon added. X-ray diffraction,
Raman scattering, transmission electron microscope, energy-dispersive
X-ray spectroscopy, and electron energy loss spectroscopy results
confirmed single-phase hBN without detectable carbon or metal impurity.
We suggest that the use of carbon provides a low-cost, stable, and
safe alternative to achieve large-sized hBN single crystals.