Interface Piezoelectric and Pyroelectric Effects in van der Waals Heterostructures

1.扫描光电流成像系统的构建设计并构建了一套扫描光电流成像系统（SPCM），该系统能够表征空间分辨的室温光电特性.过渡金属二硫属化物材料台阶处的光伏效应增强晶体缺陷，如点缺陷、位错、棱边和表面，在决定和发展凝聚态物质中涌现的物理效应和功能方面起着重要作用. 3R-MoS_2多层膜材料的应变增强光伏效应：3R-MoS_2中MoS_2层的独特堆叠顺序引起了具有C_3V点对称性的面外电极化。

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.