Newsletter August, 2013


    MIT Materials News that Matters

    August 2013
    Materials Processing Center at MIT MIT Dome
    77 Massachusetts Avenue
    Cambridge, Massachusetts 02139
    Materials Day Symposium

    and Poster Session 2013

    Photonic Materials

    October 23, 2013
    MIT, Kresge Little Theatre (W16)

    Registration Now Open
    : The conference is free of charge and open for everyone, but space is limited and registration is required. Register Now!

    Faculty Highlight: Silvija Gradecak

    Associate Professor Silvija Gradečak is developing nanowires for solar cells and light emitting diodes.

    MIT Assoc. Prof. Silvija Gradečak with CVD system for nanowires.
    Associate Professor Silvija Gradečak 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 Gradečak, 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," Gradečak 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 in lab at MIT.
    Sam Crawford explains his groundbreaking research into controlling nanowire growth in the Laboratory for Nanophotonics and Electronics at MIT.


    MIT graduate student Samuel C. Crawford, working in Associate Professor Silvija Gradečak's Laboratory for Nanophotonics and Electronics, is lending a new understanding to growing semiconducting nanowires for solar cells, LEDs and other uses.

    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.


    Upcoming Events

    MIT Great Glass Pumpkin Patch sale. Saturday, Sept. 27, 10 a.m. to 3 p.m. (Rain date, Sunday, Sept. 29).

    SPIE Optifab, Oct. 14-17, 2013, Rochester, N.Y.



    MPC Advisory Board Meeting, October 24, 2013
    Quick Links

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    Controlling semiconducting nanowire growth

    Video by Georg Haberfehlner (CEA-Leti) and Sam Crawford (MIT).
    MIT graduate student Sam Crawford, Associate Professor Silvija Gradečak, 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.

    Optical field from research demonstrating the first germanium (Ge) laser monolithically integrated on silicon substrates.
    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
    2103 Summer Scholar Scott Danielson  In Rubner lab at MIT.
    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

    Join the MPC Collegium
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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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