Engineered Materials Genomes of Artificial 2D Lattices

2019年04月09日

报告题目:Engineered Materials Genomes of Artificial 2D Lattices

报告人:李奕贤副教授, 台湾清华大学材料科学工程学系

时间:4月19日下午16:30-18:00

地点:卢嘉锡楼202报告厅

报告摘要:

Monolayers of van der Waals materials, including Graphene or transition metal dichalcogenides (TMDs), are considered ideal building blocks for constructing diverse artificial 2D lattices and hybrid hetero-systems. Heterostructures of nanomaterials, such as lateral multi-junctions of more than two different 2D monolayers, are intriguing for exploring new physics and materials properties.[1-5] Obtaining in-plane heterojunctions of monolayer TMDs with atomically sharp interfaces is very significant for fundamental research and applications. Here, a multistep chemical vapor deposition (CVD) synthesis of the in-plane multi-junctions of monolayer TMDs is presented. With optimized parameters, atomically sharp interfaces are successfully achieved in the synthesis of in-plane artificial lattices of the WS2/WSe2/MoS2 at reduced growth temperatures. Moreover, performances of the 2D monolayers were artificially engineered by geometrically tuning with 1D nanowires arrays or by physically integrating with optical microcavity.[6-8] Artificially engineering of the 2D materials offers an ideal platform to explore new physics and realize industrial applications for next-generation optoelectronics and photonics.

References

[1] Kuan-Chang Chiu, Adv. Mater. 30, 1704796 (2018)

[2] Xi-Ling et al, Adv. Mater., 28 (12), p.2322 (2016)

[3] Xin-Quan Zhang et al, Nano Lett, 15, p.410 (2015)

[4] Lili Yu et al, Nano Lett, 14, p.3055 (2014)

[5] Yi-Hsien Lee, et al., Nano Lett., 13, 1852 (2013)

[6] Xiaoze Liu et al, Nature Photonics, 9, p.30 (2015)

[7] Sam Yang et al, VLSI 2016

[8] Tung-Han Yang et al, Adv. Func. Mater., 28(7), 1706113 (2018)


报告人简介:

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Dr. Yi-Hsien Lee

Associate Professor

Dept. Materials Science and Engineering (MSE),

National Tsing Hua University (NTHU)

E-mail: yhlee.mse@mx.nthu.edu.tw

Web: www.mse.nthu.edu.tw/~yhlee/


李奕贤副教授,2001年和2005年先后获得台湾清华大学材料科学工程学系硕士和博士学位。2006年-2013历任台湾中央研究院和麻省理工学院博士后。2013年起任台湾清华大学副教授。主要从事二维半导体材料及其异质结的生长,表面科学及超高真空STM/AFM的研究及多铁材料和铁/压电器件的研究,在国际上享有盛誉。曾获有庠科技论文奖(2015年)及清华大学新进研究员奖(2015)等荣誉。