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 Karl Franzens University Graz

Graz University of Technology 

Mixed dimensional van der Waals heterostructures
Aleksandar Matkovich
Montanuniversität Leoben
16:15 - 17:15 Tuesday 21 June 2022 TUG

Video: https://tugraz.webex.com/tugraz/j.php?MTID=m1bd7ac6ce14cad7ab33ea39aee2494ac

Van der Waals (vdW) two-dimensional (2D) materials and their heterostructures enable atomically sharp interfaces of single crystalline mono layers to be integrated into devices with novel functionalities for nanoelectronics, optoelectronics, neuromorphic computing, and sensing. They have enabled realization of the atomically thin p-n junctions, sub-nanometer channel transistors, harnessing of unique interface and topological states, and many other. Besides stacking of only 2D sheets, organic semiconductors have been also used as additional constituents. Organic semiconductor crystals can be seen as zero-dimensional (0D) vdW materials – with individual molecules as 0D building blocks – and therefore, they can be a very versatile addition to the rapidly developing field of vdW heterostructures.

This talk will explain how small rod-like molecules form needle-like crystalline organic nanostructures on 2D materials through vdW epitaxy. The focus will be on unique and anisotropic properties of these hybrid vdW systems, as their nanomechanics [1], optoelectronics [2], and usage as self-assembled and self-aligned masks for pattering of 2D materials [3].


[1] Vasić, B., et.al., 2018. Molecules on rails: friction anisotropy and preferential sliding directions of organic nanocrystallites on two-dimensional materials. Nanoscale, 10(39), 18835-18845.
[2] Matković, A., et.al., 2019. Light‐Assisted Charge Propagation in Networks of Organic Semiconductor Crystallites on Hexagonal Boron Nitride. Adv. Funct. Mater., 29(43), 1903816.
[3] Aslam, M.A., et.al., 2022. Single Crystalline 2D Material Nanoribbon Networks for Nanoelectronics, preprint: arXiv:2205.09507v1.