April 29, Loucas Tsakalakos, GE Global Research
Co-sponsored by the BU ASM International Chapter.
3:00 PM in Room 105, 15 St. Mary’s Street. Refreshments served at 2:45.
Abstract: We are developing various nanostructure-enabled electronic and opto-electronic devices for various GE applications. These include nanoelectronics, nanoelectromechanical switches, sensors, and nano-photovoltaics. We have demonstrated nanotransistors with promising mobilities and sub-threshold slopes, and have been exploring various nanomanufacturing issues associated with such devices. We have also demonstrated switches based on integrated, vertically standing silicon nanowires that have the potential to replace solid-state devices for computing applications. Finally, we have shown the first large-area, all-inorganic, silicon nanowire based solar cells on stainless steel substrates for use in low-cost PV applications. This is enabled by the fact that we have observed significantly enhanced broadband optical absorption in nanowire films compared to solid films due to sub-wavelength scattering and light trapping effects. An overview of these technologies will be given.
Biography: Loucas Tsakalakos is the Manager of the Photonics Laboratory within Electrical Technologies & Systems, Micro & Nano Structures Technologies Organization at the General Electric – Global Research Center in Niskayuna, New York, USA. He received his BS degree (1995) from Rutgers University, and his MS (1998) and PhD (2000) degrees in Materials Science and Engineering (with minors in Solid State Physics and Microelectromechanical Systems) from the University of California, Berkeley. His expertise is in the integration of heterogeneous thin film and nanostructured materials systems for micro- and nano- device applications; he also has extensive experience in the characterization of materials. Since joining GE Global Research in 2000, Dr. Tsakalakos has designed and implemented integrated electronic and sensor systems for defense applications, studied cathode materials for lighting applications, and is a founding team member of GE’s Nanotechnology Program. His major area of research within that program was the development of nanostructured materials and devices, primarily using nanowires/tubes, working with multi-disciplinary teams both within GE and in collaboration with external partners. Loucas subsequently led the Advanced/Next Generation PV efforts within GE Global Research’s Solar Energy Platform. Most recently he worked within GE Energy – Solar Technologies and led a PV Module Product Engineering team at GE Global Research, where he designed, optimized, and led cost-out efforts for CdTe thin film solar modules. In his current role as manager of the Photonics Lab, Loucas leads a team of 12 Ph.D. and M.S. level scientists and engineers developing advanced photonics technologies for data communications, sensing, and novel photonics applications. Dr. Tsakalakos is a member of Tau Beta Pi (The National Engineering Honor Society), is author or co-author of over 30 journal, conference proceedings, and book chapter publications, and holds 12 U.S. patents. He has given over 40 invited presentations at international conferences, symposia, and other events.
Faculty host: Ramesh Jasti
Student host: Jiapeng Xu