直播預告|香港大學教授陸洋講述金剛石深度應變工程

直播時間：2024年4月26日（周五）20:00-21:30

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北京時間2024年4月26日晚八點，iCANX Talks 第183期邀請到了香港大學Yang Lu教授進行分享！此外，北京大學Jinchi Han，香港科技大學zhengbao YANG，澳門大學Qingsong Xu，西安理工大學Shujuan Li，香港城市大學Jun Liu，香港中文大學Yi Long等教授擔任嘉賓，復旦大學Zhuo Li教授擔任主持人。

這將是一場匯聚頂尖學者的盛會，共同探討前沿科技與學術挑戰！更多精彩，敬請期待！

【嘉賓介紹】

Yang Lu

香港大學

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.

除了作為超硬材料，金剛石事實上也是一種優異的超寬禁帶半導體材料，近年來在高性能功率電子和光電器件領域顯示出巨大潛力。基于材料尺寸效應和獨特的納米力學策略，我們展示了納米尺度的單晶金剛石針具有意想不到的高彎曲彈性，局部彈性拉伸應變可達到約9%，接近金剛石的理論彈性極限[1]。這一發現不僅挑戰了金剛石的理論拉伸強度，也為通過納米力學實現半導體深度應變工程開辟了一條新的道路。為了促進其應變器件應用，我們進一步通過微加工得到單晶金剛石的微納陣列結構，通過原位單軸拉伸力學加載，首次實現了整體均勻、接近10%的全域彈性應變 [2]。通過理論計算和初步實驗指出，這種超大彈性拉伸應變可顯著降低了金剛石的帶隙，甚至可以有望將金剛石從間接帶隙轉變為直接帶隙半導體。這一系列的前沿交叉研究為納米力學應用于金剛石等新型半導體功能器件的調控和研發提供了新的見解和解決方案，展示了“深度應變工程”在微電子、光電和量子信息技術中的巨大應用潛力。

【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.

陸洋，香港大學機械工程系HKU-100 Scholar教授，納米力學實驗室主任。他在南京大學獲得物理學學士學位，獲美國萊斯大學（Rice University）博士學位，并在麻省理工學院的納米力學實驗室從事博士后研究。此前，他于2012至2022年期間在香港城市大學擔任助理教授、副教授和正教授。陸洋課題組長期致力于實驗微納米力學的研究，及其在半導體集成電路與先進制造中的產業應用，以第一或通訊作者在 Science、Nature Nanotechnology、Nature Materials、Nature Communications、Science Advances等學術刊物發表文章200余篇，并擔任國際期刊 Materials Today 的副主編以及《國家科學評論》、《中國科學:技術科學》、《Acta Mechanica Sinica》、《極端制造》、《Functional Diamond》、《Materials for Quantum Technology》等學術期刊的編委。陸教授曾獲得香港大學教育資助委員會(UGC)杰出青年學者獎 2013/14，并入選并完成首屆(2019 年)國家自然科學基金(NSFC)優秀青年科學基金(港澳)項目，以及入選首屆香港研究資助局(RGC)研資局研究學者計劃 2020/21，并于2022年當選為香港青年科學院（YASHK）成員。