<正>Van der Waals heterostructure,which consists of various twodimensional(2D)layered materials stacked along the direction perpendicular to their 2D plane,has emerged as a promising material system for device applications in recent years[1].Due to the weak van der Waals interlayer force,2D layered materials with very different lattice constants can be stacked without being constrained by the traditional‘‘lattice-match"condition to form high

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