Interface Piezoelectric and Pyroelectric Effects in van der Waals Heterostructures

1. 设计并构建了一种能够表征空间分辨的室温光电特性的扫描光电流成像系统。晶体缺陷，如点缺陷、位错、边缘和表面，在凝聚态物质中决定和发展新兴的物理效应和功能方面起着重要的作用。3R-MoS2多层材料的应变增强光伏效应。在3R-MoS2中，MoS2层独特的堆叠顺序使其在面外方向产生C_3V点对称的电极化。

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.