1988 — 1991 |
Salamanca-Riba, Lourdes |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Row: Structural Studies of Semiconductor Heterostructures Using Transmission Electron Microscope @ University of Maryland College Park
This Research Initiation Award is made under the National Science Foundation Research Opportunities for Women Program. The objective of the investigation is to study the structure of Group IV-VI semiconductor heterostructures and superlattices grown by molecular beam epitaxy. The emphasis is to relate the structure of these materials to their physical properties and potential device performance. The microstructure, crystallographic structure, and defect structure will be characterized using transmission electron microscopy and computer-assisted image simulation. The initial studies will be made on lead telluride- lead europium selenium telluride superlattices and heterostructures, but other IV-VI chemical systems will be investigated as the research progresses. The defects will be related to the electronic, magnetic and optical properties of the superlattices and heterostructures.
|
1 |
1991 — 1994 |
Salamanca-Riba, Lourdes |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Transmission Electron Microscopy of Semiconductor Thin Films @ University of Maryland College Park
This study concentrates on high resolution electron microscopy(TEM) of compound semiconductor films for increased understanding of the relationships between atomic level structural characteristics, electrical and optical properties, and details of advanced materials synthesis and processing methods. Additionally, it is anticipated that these research efforts will provide a basis for relating observed microscopic features to subsequent optical and electronic device performance.
|
1 |
1994 — 1998 |
Salamanca-Riba, Lourdes |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Misfit Accommodation, Ordering, and Stability in Semiconductor Thin Films @ University of Maryland College Park
9321957 Salamanca-Riba The proposed research addresses fundamental materials science issues surrounding the mechanism of lattice mismatch accommodation in semiconductor films, and the effect of lattice mismatch on the formation of ordered phases and the stability of semiconductor heterostructures. Transmission electron microscopy will be used to investigate the mechanism for misfit accommodation, structural ordering, and stability of semiconductor alloys of different systems and compositions grown on different substrates (buffer layers) to study the effect of lattice mismatch on the structure of semiconductor films. The misfit accommodation mechanism will be studied in systems with large and small lattice mismatches. Materials will be grown using either molecular beam epitaxy or metal organic chemical vapor deposition. The effects of growth parameters and growth methods on the structure and quality of the films will be investigated to obtain films with low defect density and single phase; special emphasis will be placed on understanding the critical initial stages of growth. %%% Most advanced electronic and photonic devices consist of compound semiconductor heterostructures whose structural integrity and quality are of critical importance, and very often determine the performance and applicability of a device technology. In this context, the accommodation of lattice mismatches between the different layers in a heterostructure and between the film and the substrate, is of fundamental significance. The proposed research will significantly benefit our basic understanding, control, and general ability to achieve improved materials for devices and circuits needed in the general areas of telecommunications, information processing; and high speed computing. ***
|
1 |
2006 — 2008 |
Popper, Arthur (co-PI) [⬀] Eichhorn, Bryan (co-PI) [⬀] Salamanca-Riba, Lourdes Ouyang, Min (co-PI) [⬀] Cumings, John (co-PI) [⬀] |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Mri: Acquisition of Analytical Spectrometers For the Creation of a Regional Transmission Electron Microscopy Facility For Research and Education @ University of Maryland College Park
Technical Abstract
The University of Maryland will form a regional microscopy facility through the acquisition of key instrumentation for a pair of new transmission electron microscopes (TEMs). The requested equipment includes analytical spectrometers for a JEOL 2100F field-emission TEM (installation 2/06) and specialized specimen holders for use with a new JEOL 2100 LaB6 TEM (installation 7/06). The spectrometers include an energy dispersive X-ray spectrometer and an electron energy loss spectrometer with spectral camera. The specimen holders will allow heating to 1273 K and cryogenic specimen transfer at 77 K. These additions to our facility will create a one-of-a-kind regional university facility in the Washington, DC metropolitan area, and will be a shared experimental facility for the NSF-MRSEC at UMD. Some of the research areas to be addressed with the requested instrumentation include: (a) structure and composition of multi-functional materials (both hybrid organic-inorganic systems and multiferroic self-assembled nanocomposite films); (b) the understanding of auditory sensory cells in birds and fish; (c) the structure and composition of doped semiconductor nanomaterials for spintronic applications; and (d) phase transitions of ferromagnetic shape memory alloys. The microscopy facility will be used in educational programs for undergraduate, graduate and postdoctoral students, and for training student researchers at the University of Maryland and five university partners in the DC area. The microscopes will enhance our K-12 educational outreach activities by providing virtual microscopy courses over the web and support other campus activities such as the ASM Materials Training Camp for teachers and Project Lead the Way.
Lay Abstract
Transmission electron microscopy is one of the most powerful tools for research in the fields of nano- and bio- technology. These microscopes can magnify up to 1.5 million times and allow the observation of materials at the atomic level. Through this proposal, the University of Maryland will acquire spectrometers for our new microscopes allowing us to form a unique new regional facility for cutting edge electron microscopy research and training across all educational levels. The facility will service the needs of institutions throughout the Washington, DC metropolitan area, including five partner Universities. This facility builds on a strong foundation at the University of Maryland in the areas of electron microscopy, nanotechnology and bioscience and will allow researchers to find pathways to better magnetic sensors, faster microelectronic devices, materials that change shape under applied fields, new nanoparticle catalysts, the understanding of sensory cells used in hearing and other biological functions. Many of these projects are also keystone areas in the Materials Research Science and Engineering Center already funded at UMD by NSF. The microscopy facility will be used in educational programs for undergraduate, graduate and postdoctoral students, and for training student researchers at the University of Maryland and five university partners in the DC area. The microscopes will enhance our K-12 educational outreach activities by providing virtual microscopy courses over the web and support other campus activities such as the ASM Materials Training Camp for teachers and Project Lead the Way.
|
1 |