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Virginia Boix: Towards two-dimensional Van Der Waals stacked heterostructures via electron assisted growth

posted 6 Aug 2019, 08:01 by info admin   [ updated 12 Aug 2019, 07:52 ]
Virgínia Boix1, Tamires Gallo1, Niclas Johansson3, Alexei Zakharov3, Claudia Struzzi3, Zhihua Yong1, Lassi Linala1, 
Joachim Schnadt1,2,3, Anders Mikkelsen1,2, Jan Knudsen1,3 
1Division of Synchrotron Radiation Research, Lund University, Lund, Sweden 2NanoLund, Lund University, Lund, Sweden 
3MAX IV Laboratory, Lund University, Lund, Sweden 

Stacked Van Der Waals heterostructures of two-dimensional (2D) materials are promising building blocks for a wide range of applications [1]. These 2D materials, such as hexagonal boron nitride (h-BN) or graphene (Gr), are usually grown in-situ on active single crystal surfaces by chemical vapor deposition (CVD) [2]. However, this growth technique is self-limiting to one monolayer. Therefore, scalable mass production of high-quality stacked 2D layers cannot be achieved. 
With this contribution, we present a variety of CVD that overcomes such limitations; Electron Assisted Growth. Using STM and XPS we demonstrate that borazine dosing combined with an electron beam results in adsorption of borazine radicals atop an otherwise inert Gr film. Furthermore, we analyse the thermal stability of the adsorbate layer while probing their composition with XPS and their structure with STM. Finally, we present how a focused LEEM electron beam can be used to spatially control the formation of the BN structures onto the Gr layer.  
As an outlook, the scalability of electron assisted growth to other substrates and materials is also discussed. 

[1] K. S. Novoselov, et al. Science 353 (2016).
[2] F. H. Farwick zum Hagen, et al. ACS Nano 10 (12) (2016)

Virginia Boix is currently a Ph.D. candidate at the Synchrotron Radiation Research department in Lund University. She received her B.Sc. degree in Physics from Lund University (2016) after which she specialised in Materials Science with a M.Sc. degree (2018).  
Her research focuses on two-dimensional materials, their growth, characterisation and functionalisation. Her experimental approach includes a combination of chemically and structurally sensitive techniques, such as XPS, STM, LEED and LEEM.