2021 Webinars

Abstract: The management of the 2D Crystal Consortium Materials Innovation Platform strongly believes in the importance of both reaching out to the current generation of materials and tool experts and contributing to the education of the next generation. This webinar will highlight the variety of our innovative education and outreach programs of the 2DCC. In addition to organizing conferences and workshops, hosting monthly research webinars and bringing a number of training resources online, there are also opportunities for on-site training for graduate students and postdoctoral scholars through our RSVP program and for undergraduates through our 2DCC-affiliated REU site.

Speaker: Hans Boschker, Woflgang Braun and Dong Yeong Kim

Staff scientists, Max Planck Institute for Solid State Research Stuttgart, Germany

Abstract: We propose and demonstrate a novel thin film epitaxy technique combining the advantages of molecular beam epitaxy (adsorption-limited growth modes, ultrapure elemental sources) and pulsed laser deposition (no limitations in source and substrate temperatures as well as background gas composition, extremely simple in-vacuum setup). In such a thermal laser epitaxy system, multiple elemental sources that can be exchanged by the same mechanism as the substrates are heated thermally and continuously by individual laser beams. Substrate heating is performed by a CO₂ laser, allowing temperatures exceeding 2000 °C.

We demonstrate the UHV deposition of practically all elements in the periodic table, including W, Ta, C, Nb and Mo, as well as the deposition of oxide films from elemental metal sources in 10% ozone, 90% oxygen background pressures as high as 10⁻² hPa.

The advantages and promises of this clean, simple, fast and versatile new technique are presented and discussed in detail.

Abstract: Deciphering self-organization mechanisms of nanostructures (e.g., nanodots, ripples) and low-dimensional state systems (e.g., 2D materials, ultrathin films, etc...) on complex materials (i.e., compound semiconductors [1], alloys, metallic glass [2]) via low-energy ion beam irradiation is critical to manipulate functionality in nanostructured systems. By operating at ultra-low energies near the damage threshold, irradiation-driven defect engineering can be optimized (e.g., 10-500 eV).  Tunability of optical, electronic, magnetic, and nuclear detection properties is realized by reaching metastable phases controlled by irradiation. This talk summarizes emerging research that exploits irradiation-driven materials modification with applications in: nanophotonics, nanoelectronics, biomaterials and nuclear detection.  Furthermore, advances of in-situ analysis conducted during modification to correlate tunable irradiation synthesis and device performance will be summarized [3]. 

[1] M Lively et al. Sci. Reports 10, (2020) 8253

[2] P. Luo et al. ACS Appl. Nano Mater 3, 12 (2020) 12025

[3] J.P. Allain and A. Shetty, J. Phys. D: Appl. Phys. 50, 28 (2017) 283002

Bio: Jean Paul Allain is the inaugural head of the Ken and Mary Alice Lindquist Department of Nuclear Engineering. He holds the Lloyd and Dorothy Foehr Huck Chair in Plasma Medicine in the Huck Institutes of the Life Sciences, and he is a faculty co-hire of the Institute for Computational and Data Sciences. Allain was professor and associate head of graduate programs in the Department of Nuclear, Plasma and Radiological Engineering at the University of Illinois at Urbana-Champaign (UIUC) from 2013 until 2019 and was assistant and associate professor in nuclear engineering at Purdue University from 2007 to 2013. His group’s research areas include advanced functional bio interfaces, advanced nuclear fusion interfaces, multi-scale computational irradiation surface science, nanostructured functional materials, adaptive and self-healing interfaces, sustainable nanomanufacturing, and in-situ, in-operando material surface diagnostics.