直播时间：2024年4月26日（周五）20:00-21:30

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北京时间2024年4月26日晚八点，iCANX Talks 第183期邀请到了香港大学Yang Lu教授进行分享！此外，北京大学Jinchi Han，香港科技大学zhengbao YANG，澳门大学Qingsong Xu，西安理工大学Shujuan Li，香港城市大学Jun Liu，香港中文大学Yi Long等教授担任嘉宾，复旦大学Zhuo Li教授担任主持人。

这将是一场汇聚顶尖学者的盛会，共同探讨前沿科技与学术挑战！更多精彩，敬请期待！

【嘉宾介绍】

Yang Lu

香港大学

Deep Strain Engineering of Diamond for Semiconductor and Optoelectronics Applications

【Abstract】

Diamond, as an ultra-wide bandgap semiconductor, has shown immense potential in the fields of high-performance power electronics and optoelectronics in the recent years. Taking advantage of size effect and nanomechanical strategies, we showed that the single-crystalline diamond needles at the nanometer scale can have unexpected high flexural elasticity, with local elastic strain up to ~9%, approaching diamond’s theoretical elastic limit [1]. This discovery opens up the opportunity to modulate diamond’s semiconductor properties alternatively by "deep elastic strain engineering". To realize such strain-engineered device applications, we further microfabricated single-crystalline diamond microbridge arrays and have mechanically achieved sample-wide uniform, up to ~10 %, ultralarge elastic strains under uniaxial tensile loading [2]. This ultralarge strain significantly reduced the diamond bandgap by >2eV or convert diamond from indirect bandgap to direct bandgap semiconductor. Our works offer new insights and solutions for applying nanomechanics for diamond functional devices, which demonstrates great application potential of "deep strain engineering" for future microelectronics, optoelectronics, and quantum information technologies.

References:

[1] A Banerjee, D Bernoulli, H Zhang, M.F. Yuen, J Liu, J Dong, F Ding, J Lu, M Dao*, W Zhang*, Y Lu*, S Suresh* "Ultralarge elastic deformation of nanoscale diamond" Science 360 (6386), 300-302, 2018.

[2] C Dang, JP Chou, B Dai, CT Chou, Y Yang, R Fan, W Lin, F Meng, A Hu*, J Zhu*, J Han, A M Minor, J Li*, Y Lu* “Achieving large uniform tensile elasticity in microfabricated diamond” Science 371 (6524), 76-78, 2021.

除了作为超硬材料，金刚石事实上也是一种优异的超宽禁带半导体材料，近年来在高性能功率电子和光电器件领域显示出巨大潜力。基于材料尺寸效应和独特的纳米力学策略，我们展示了纳米尺度的单晶金刚石针具有意想不到的高弯曲弹性，局部弹性拉伸应变可达到约9%，接近金刚石的理论弹性极限[1]。这一发现不仅挑战了金刚石的理论拉伸强度，也为通过纳米力学实现半导体深度应变工程开辟了一条新的道路。为了促进其应变器件应用，我们进一步通过微加工得到单晶金刚石的微纳阵列结构，通过原位单轴拉伸力学加载，首次实现了整体均匀、接近10%的全域弹性应变 [2]。通过理论计算和初步实验指出，这种超大弹性拉伸应变可显著降低了金刚石的带隙，甚至可以有望将金刚石从间接带隙转变为直接带隙半导体。这一系列的前沿交叉研究为纳米力学应用于金刚石等新型半导体功能器件的调控和研发提供了新的见解和解决方案，展示了“深度应变工程”在微电子、光电和量子信息技术中的巨大应用潜力。

【BIOGRAPHY】

Yang Lu is currently HKU-100 Scholar Professor in Mechanical Engineering at the University of Hong Kong (HKU). He received his BS degree in Physics from Nanjing University and PhD degree in Mechanical Engineering from Rice University, and did his postdoctoral research in the Nanomechanics Lab at MIT. Previously, he worked at City University of Hong Kong as Assistant Professor, Associate Professor and Full Professor during 2012 to 2021. Prof. Lu’s research focuses on experimental micro/nanomechanics and its applications in semiconductor and advanced manufacturing. He has published more than 200 articles in leading academic journals including Science, Nature Nanotechnology, Nature Materials, Nature Communications and Science Advances. Professor Lu serves as Associate Editor for the international journal Materials Today, as well as a board member for academic journals such as National Science Review, Journal of China University of Science and Technology: Technology Sciences, and Acta Mechanica Sinica. Prof. Lu is a recipient of UGC Early Career Award 2013/14, the inaugural NSFC Excellent Young Scientists Fund (Hong Kong and Macau) 2019 and RGC Research Fellow scheme (RFS) 2020/21. He is an elected member of the Hong Kong Young Academy of Sciences (YASHK) in 2022.

陆洋，香港大学机械工程系HKU-100 Scholar教授，纳米力学实验室主任。他在南京大学获得物理学学士学位，获美国莱斯大学（Rice University）博士学位，并在麻省理工学院的纳米力学实验室从事博士后研究。此前，他于2012至2022年期间在香港城市大学担任助理教授、副教授和正教授。陆洋课题组长期致力于实验微纳米力学的研究，及其在半导体集成电路与先进制造中的产业应用，以第一或通讯作者在 Science、Nature Nanotechnology、Nature Materials、Nature Communications、Science Advances等学术刊物发表文章200余篇，并担任国际期刊 Materials Today 的副主编以及《国家科学评论》、《中国科学:技术科学》、《Acta Mechanica Sinica》、《极端制造》、《Functional Diamond》、《Materials for Quantum Technology》等学术期刊的编委。陆教授曾获得香港大学教育资助委员会(UGC)杰出青年学者奖 2013/14，并入选并完成首届(2019 年)国家自然科学基金(NSFC)优秀青年科学基金(港澳)项目，以及入选首届香港研究资助局(RGC)研资局研究学者计划 2020/21，并于2022年当选为香港青年科学院（YASHK）成员。