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Two-dimensional semiconductor HfSe2
van der Waals heterostructures by molecular beam epitaxy
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Using molecular beam epitaxy, atomically thin 2D semiconductor HfSe2 and MoSe2/HfSe2 van der Waals heterostructures are grown on AlN(0001)/Si(111) substrates. Details of the electronic band structure of HfSe2 are imaged by in-situ angle resolved photoelectron spectroscopy indicating a high quality epitaxial layer. High-resolution surface tunneling microscopy supported by first principles calculations provides evidence of an ordered Se adlayer, which may be responsible for a reduction of the measured workfunction of HfSe2 compared to theoretical predictions. The latter reduction minimizes the workfunction difference between the HfSe2 and MoSe2 layers resulting in a small valence band offset of only 0.13 eV at the MoSe2/HfSe2 heterointerface and a weak type II band alignment.
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