报告题目：Two-dimensional semiconductor wafers towards practical manufacturing
报 告 人：叶堉 助理教授（北京大学）
Abstract: Semiconductor electronic technology in the post-Moore era continues to look for technology solutions to reduce the size of devices to the atomic level, while at the same time new architectures to add more functionality to the semiconductor devices. Due to its atomic thickness and stackability, two-dimensional (2D) semiconductor materials are expected to get rid of the micro-nano processing procedures of traditional silicon-based semiconductors and realize new semiconductor chip manufacturing technologies. However, in order to realize integrated circuits, the device uniformity is critical, and the preparation of 2D semiconductor single crystal wafers must be realized first. By understanding the solid-to-solid phase transition mechanism from 1T' to 2H MoTe2, we have achieved the controllable preparation of 2H MoTe2 single crystal wafers through a seeded 2D epitaxy process. Moreover, the 2D semiconductor 2H MoTe2 wafers can be heterogeneously integrated on arbitrary single crystal substrates through direct growth, which is not limited by lattice matching. The heterogeneous integration further adds new functionality to the semiconductor devices that previously impossible. Electrical characterizations show that the 2D semiconductor single crystal wafer has high electron mobility and electrical uniformity, which can be used for the practical manufacturing of 2D atomic material chips.
Brief CV: Yu Ye is an assistant professor in the School of Physics at Peking University. He received his Ph.D. degree in condensed matter physics from Peking University in 2012. Prior to joining PKU in July 2016, Yu was working as a postdoctoral researcher at the University of California, Berkeley. His group (http://faculty.pku.edu.cn/yeyu) currently is interested in light-matter interactions and electrical transport properties in condensed matter physics, with an emphasis on novel physical phenomena emerging in atomically-thin materials, van der Waals heterostructures and surfaces/interfaces by nanoscale device designs, low-T-high-B optical spectroscopy, and electrical transport measurements. Yu published more than 80 research papers and earned >4800 citations with an h-index of 33.