https://teams.microsoft.com/l/meetup-join/19%3ameeting_ODgwZjQ4MDAtZjI1OC00ZTgzLWJkZjQtNjI4YzhmMGY3N2M4%40thread.v2/0?context=%7b%22Tid%22%3a%228d281d1d-9c4d-4bf7-b16e-032d15de9f6c%22%2c%22Oid%22%3a%2282b236cb-6c1e-47d6-a632-271521bb935a%22%7d

Abstract:

The integration of any new material into device architectures necessarily requires interfaces with dissimilar materials. In the case of semiconducting transition metal dichalcogenides (TMDCs) these include metal-TMDC, insulator-TMDC and semiconductor-TMDC interfaces. Presented will be a summary of our work on metal-TMDC and Insulator-TMDC interface chemistries studied using in-situ XPS. The second portion of this presentation will focus on the process dependent structure of grown TMDCs. We use in-vacuo characterization techniques to study the growth of TMDCs by molecular beam epitaxy on a range of substrate. Finally, time permitting, I will diverge from the presentation title and present a snapshot of our most resistant work on copper-based anti-viral coatings.

Biography:

Stephen McDonnell graduated from Dublin City University with a B.Sc. in Applied Physics in 2004 and a Ph.D. in Physical Sciences in 2009 under the supervision of Prof. Greg Hughes. He worked as a postdoctoral research and research scientist in Materials Science Department at UT-Dallas with Prof. Robert Wallace were his work include on studying nucleation in atomic layer deposition, atomically precise manufacturing, and 2D materials integration for nanoelectronics. In 2015 he joined the Materials Science and Engineering Department at the University of Virginia as an Assistant Professor.

His current research interests are centered on the integration of 2D materials into device architectures involving interfaces with 3D materials. Device applications for these materials include photovoltaics, logic, low powered transistors, flexible electronics, thermoelectrics, and photoelectrochemistry. The McDonnell group seeks to synthesis 2D materials Molecular Beam Epitaxy and study their electronic structure by in-vacuo photoelectron spectroscopy techniques including XPS, and APRES. The group correlates processing conditions with resultant materials structure and interface chemistry while engaging in collaborations to investigate how this impacts device relevant properties such as contact resistance, thermal boundary conductance, photocurrents, and ZT. McDonnell is also currently investigating the anti-viral properties of copper based alloys. In this work he correlates the surface chemistry with corrosion behavior and anti-viral efficacy.