Optical response of van der Waals heterointerface by symmetry engineering

在过去的一年里，我专注于3R-MoS2的体压电效应。通过应变3R-MoS2，转动对称性被破坏，我们预计会出现面内极化。因此，我们观察到了体压电伏效应。应变显著提高了体光伏(BPV)响应，应变增加0.2%，体光伏系数增加至少两个数量级。这项研究发表在2022年11月的《自然纳米技术》杂志上。去年，我还在华盛顿大学徐晓东实验室进行了一次研究实习，在那里我学到了许多在器件制造和光学设施建设方面的有用技能。

In the past year, I focused on bulk piezophotovoltaic effect in 3R-MoS2. By straining 3R-MoS2, the rotational symmetry is broken, and we expect an in-plane polarization to arise. Thus, we observed the bulk piezophotovoltaic effect. The bulk photovoltaic (BPV) response is greatly enhanced by strain and the BPV coefficient increases at least two orders by 0.2% of strain. This work was published in Nature Nanotechnology in Nov 2022. Last year, I also carried out a research internship in Xiaodong Xu lab, University of Washington, where I learnt many useful skills in device fabrication and optical set-up construction.