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Top- and side-views (a) for the α-CSe/β-CSe vdW hetrostructure. The three red dashed frames are the rectangle unit cell of α-CSe, β-CSe and the heterostructure, respectively. The band structure (b) and density of states (c) refer to vacuum level. The band decomposed charge density of the CBM (d) and VBM (e) in the α-CSe/β-CSe vdW heterostructure. The value of isosurfaces is 0.03 e/Å3. The hollow and solid spheres represent the top and bottom layers, respectively.
