Interface Piezoelectric and Pyroelectric Effects in van der Waals Heterostructures

1. 扫描光电流测绘系统的构建设计并构建了扫描光电流测绘（SPCM）系统，该系统能够表征空间分辨的室温光电特性。2．过渡金属二硫族化物材料的增强光伏效应点缺陷、位错、边缘和表面等晶体缺陷在决定和发展凝聚态物理效应和功能方面发挥着重要作用。 3． 3R-MoS2 多层材料中的应变增强光伏效应。3R-MoS2 中 MoS2 层独特的堆叠顺序导致面外方向的电极化，具有 C_3V 点对称性。

1. Construction of a scanning photocurrent mapping systemA scanning photocurrent mapping (SPCM) system has been designed and constructed, which is able to characterize spatially resolved room temperature photoelectric properties.2. Enhanced photovoltaic effect at the steps of transition metal dichalcogenide materialsCrystallographic defects, such as point defect, dislocations, edge, and surface, constitute an important role in determining and developing emergent physical effects and functionalities in condensed matters.3. Strain enhanced photovoltaic effect in 3R-MoS2 multi-layer materials.The unique stacking sequence of MoS2 layers in 3R-MoS2 gives rise to an electrical polarization in the out-of-plane direction with a C_3V point symmetry.