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Motta, Antonella |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Marquez-Velasco, J.
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article
Two-dimensional semiconductor HfSe2 and MoSe2/HfSe2 van der Waals heterostructures by molecular beam epitaxy
Abstract
<p>Using molecular beam epitaxy, atomically thin 2D semiconductor HfSe<sub>2</sub> and MoSe<sub>2</sub>/HfSe<sub>2</sub> van der Waals heterostructures are grown on AlN(0001)/Si(111) substrates. Details of the electronic band structure of HfSe<sub>2</sub> 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 HfSe<sub>2</sub> compared to theoretical predictions. The latter reduction minimizes the workfunction difference between the HfSe<sub>2</sub> and MoSe<sub>2</sub> layers resulting in a small valence band offset of only 0.13 eV at the MoSe<sub>2</sub>/HfSe<sub>2</sub> heterointerface and a weak type II band alignment.</p>