Associate Professor Silvija Gradeńćak is developing nanowires for solar cells and light emitting diodes.
Associate Professor Silvija Gradeńćak with a metal organic chemical vapor deposition system used to create nanowires from metal seed particles.
The next generation of solar cells may be flexible, transparent and more energy efficient, says Silvija Gradeńćak, the Thomas Lord Associate Professor in Materials Science and Engineering, whose Laboratory for Nanophotonics and Electronics at MIT is working to develop semiconducting nanowires for solar cells, as well as for light emitting diodes (LEDs) that can replace inefficient light bulbs.
"Nanostructured materials would enable development of solar cells that are flexible, can be produced in large scale using roll to roll processing, and are potentially transparent, meaning that we could use them on surfaces like windows, cars, etc. The new class of nanostructured solar cells is not necessarily competing with the existing silicon technology, but it would enable development of devices that do not exist on the market right now. The goal is to develop solar cells that absorb as much solar light as possible and at the same time, we are developing LEDs that are producing light in as efficient a manner as possible," Gradeńćak said. Read more.
Controlling the growth of semiconducting nanowires MIT doctoral candidate Sam Crawford has contributed to fundamental understanding of growth processes using metal seed particles.
Sam Crawford explains his groundbreaking research into controlling nanowire growth in the Laboratory for Nanophotonics and Electronics at MIT.
Crawford's research demonstrated control of the composition and diameter along individual nanowires composed of indium gallium nitride (InGaN) by varying the flow of gaseous precursors containing the desired materials, such as gallium, through a quartz chamber containing substrates coated with gold seed particles. "Essentially what we're doing is changing the flows of our III and V precursors (elements from columns III and V of the periodic table) during growth in order to change the composition and morphology of the nanowires," Crawford said. Crawford and colleagues grew nanowires with a "caterpillar" shape by alternating indium nitride and indium gallium nitride layers within the nanowire, leading to changes in diameter.Read more.
MIT Great Glass Pumpkin Patch sale. Saturday, Sept. 27, 10 a.m. to 3 p.m. (Rain date, Sunday, Sept. 29).
Video by Georg Haberfehlner (CEA-Leti) and Sam Crawford (MIT).
MIT graduate student Sam Crawford, Associate Professor Silvija Gradeńćak, and colleagues grew semiconducting nanowires which exhibited a "caterpillar" shape by alternating the composition in InN/InGaN heterostructure nanowires. The team developed an experimental process for controlling the composition and diameter along individual nanowires, as well as a theoretical model to guide nanowire growth, which could lead to better solar cells, LEDs and sensors.
Materials Day sessions to focus on Photonics Topics will range from revolutionary fabrics and fibers to next generation communications.
Multislot waveguide design for confining optical power in low index materials
Photonic Materials will be the focus of this year's Materials Day event, on Wednesday, Oct. 23, 2013, from 8:45 a.m. to 3:15 p.m. in Kresge Auditorium (W16) on the MIT campus.
In the past decade, there have been great advances in the development of photonic materials for applications ranging from optical interconnections for microelectronic circuits to new biomedical systems enabled by innovations in materials processing.
This year's Materials Day presenters are:
- Dr. Julie Brown, Senior Vice President and CTO, Universal Display Corp., "New wave of materials challenges and opportunities in the growing industry of Organic Light Emitting Devices."
- Yoel Fink, Director, Research Laboratory of Electronics and Professor, Department of Materials Science and Engineering, MIT, "How far can a shirt see: the birth of a revolution in fibers and fabrics." Read more.
Summer Scholars tackle innovation in MIT faculty labs
Scott Danielson worked on capturing a protein: prostate specific antigen.
Working in the lab of Assistant Professor Polina Anikeeva, Summer Scholar Mila'na Jones learned to synthesize magnetic nanoparticles that could potentially be used in minimally invasive surgery and in treating Parkinson's disease and depression.
James Haynes worked in Professor Ron Ballinger's lab on a corrosion resistant material for coating submarine shafts that connect a propeller to the engine.
Stephanie Tzouanas developed a protocol and conducted tests of severalpotential materials to control drug diffusion in an implantable chemotherapeutic device for the treatment of ovarian cancer. See related video.
They were three among 18 young researchers hosted at MIT through the Materials Processing Center and Center for Materials Science and Engineering's Summer Scholars Program.
Funded primarily through the National Science Foundation's Research Experiences for Undergraduates (REU) program, the MPC-CMSE program started in 1983 and has brought hundreds of the best science and engineering undergraduates in the country to MIT for graduate-level materials research. Read more
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About MPC The goals of the Materials Processing Center are to unite the materials research community at MIT and to enhance Institute-industry interactions. Collaboration on research ventures, technology transfer, continuing education of industry personnel, and communication among industrial and governmental entities are our priorities. The MPC Industry Collegium is a major vehicle for this collaboration. The MPC sponsors seminars and workshops, as well as a summer internship for talented undergraduates from universities across the U.S. We encourage interdisciplinary research collaborations and provide funds management assistance to faculty.
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