Van der Waals dielectric material for two-dimensional electronic devices

Two-dimensional (2D) materials have emerged as a potential choice for semiconductor technology due to their atomic-level thickness and excellent electronic properties. However, the integration of conventional high dielectric constant dielectrics into 2D semiconductor devices faces a number of challenges that can cause severe damage and interference to the surface of the 2D material. Recent studies have shown that van der Waals (vdW) dielectrics without suspended-bond surfaces are compatible with 2D material surfaces and can be a good solution to this issue. In this review, we will focus on the novel vdW dielectrics in terms of synthesis techniques, properties, and device applications. First, the fundamentals of dielectrics and measurement will be briefly introduced, as well as the main preparation techniques of vdW dielectrics. Second, recent advances in vdW dielectrics will be presented, and the electronic properties of vdW dielectrics will be discussed in depth. In addition, we will present the modulation of 2D device performance using vdW dielectrics as well as novel functionalities of vdW dielectrics. Finally, we will address the current challenges in terms of material design, physics mechanism, and device application.