Solution Growth of Semiconductor Nanorods and Nanowires and Application of their Directed Assemblies to Photovoltaics, Photoemission and Lithium ion Batteries Anodes

Special Applied Physics & Applied Mathematics Department Seminar
Thursday, August 2, 2018, 3:00 PM, 214 Mudd

Prof. Kevin M. Ryan
University of Limerick, Ireland

Title: Solution Growth of Semiconductor Nanorods and Nanowires and Application of their Directed Assemblies to Photovoltaics, Photoemission and Lithium ion Batteries Anodes

Abstract: Here I will discuss  recent advances from my research group on the solution synthesis of a range of semiconductors: II-VI, IV, I-VI, I-III-VI2, I2-II-IV-VI4 in nanocrystal and nanowire form. In the colloidal nanocrystal structures, the main focus of the work is on copper chalcogenides where fine tuning of synthesis conditions can allow dot, polytypic rod and tetrapod formation to be obtained.  We have progressed methods to assemble colloidal nanorods of these compounds  from solution over device scale areas using both self and directed assembly (Electric field driven) and applied these ensembles for amplified spontaneous emission and photovoltaics.  The second part of the talk will discuss our related works on the solution growth of seeded nanowires of silicon and germanium and their linear and branched heterostructures. In this approach we can grow the nanowires directly from an electrode in solution and utilise these as lithium ion battery anodes in half and full cell configurations. The nanowire anodes demonstrate exceptional discharge capacities and cycle life with performances that are tuneable by material composition.

Professor Kevin M. Ryan holds a Personal Chair in Chemical Nanotechnology at the Department of Chemical Sciences in the School of Natural Sciences and is Theme Leader for Energy and Electronic Materials at the Bernal Institute.  He has served as course director for the Pharmaceutical and Industrial Chemistry Degree for the past 6 years. He is a native of Limerick and graduated with a BSc in 1999 and a PhD in 2003 in Chemistry from University College Cork. He subsequently held Marie Curie Fellowship positions at Merck Chemicals Southampton, UK and at the University of California, Berkeley, USA, prior to joining University of Limerick in 2006 as a Science Foundation Ireland Principal Investigator and Stokes Lecturer. He has published over 100 academic papers and holds several patents with research interests in semiconductor nanocrystals and nanowires for applications in electronic devices, batteries and solar-cells.


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