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Organic single-crystalline p-n junction nanoribbons fabricated
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ne-dimensional organic p-n junctions have attracted much attention due to their optoelectronic properties as well as their use as ideal systems for understanding basic chargetransport and photovoltaic behavior at organic–organic interfaces. However, fabricating organic one-dimensional p-n junctions is still a great challenge in the area of organic electronics. Now, W. Hu of the Chinese Academy of Sciences, A.L. Briseno of the University
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Credit: Justin Knight
Materials Researchers
Subra Suresh Director National Science Foundation
Credit: Bill Cardoni/Bucknell U
Subra Suresh was sworn in as the 13th director of the National Science Foundation (NSF) on October 18, 2010.
John C. Bravman President Bucknell University
John C. Bravman has been named the 17th president of Bucknell University. He began his duties as president on July 1, 2010, and the inauguration was held in November. For the last 11 years, Bravman, 52, has overseen Stanford University’s undergraduate program as FreemanThornton Vice Provost for Under-
nanoribbon solar cells. The crystallization of F16CuPc onto a CuPc nanoribbon as a template is based on F16CuPc and CuPc similar molecular structures, lattice constants, and π-stacking along the nanoribbon axis. The ambipolar transport of the CuPc and F16CuPc (p-n) junction nanoribbons is then characterized with balanced carrier mobilities of 0.05 cm2 V−1 s−1 and 0.07 cm2 V−1 s−1, respectively. The nanoribbon photovoltaic device based on such a p-n junction shows current rectification under AM 1.5 simulated light.
of Massachusetts, S.C.B. Mannsfeld of Synchrotron Radiation Lightsource, and their colleagues have used physical vapor transport growth to fabricate CuPc (p-type) and F16CuPc (n-type) singlecrystal nanoribbon. The synthesis of ntype F16CuPc is based on the selective crystallization of CuPc nanoribbon as a template. As described in the August 3rd online edition of the Journal of the American Chemical Society (DOI: 10.1021/ ja102779x), the researchers prepared the CuPc–F16CuPc (p-n type) nanoribbon junction through physical vapor transport and demonstrated their use in ambipolar transistors and discrete
Shenqiang Ren
Previously, Suresh, 54, served as dean of the engineering school and as Vannevar Bush Professor of Engineering at the Massachusetts Institute of Technology (MIT). A mechanical engineer who later became interested in materials science and biology, Suresh has done pioneering work studying the biomechanics of blood cells under the influence of diseases such as malaria. Suresh was nominated by President Obama to become the new NSF director on June 8. He replaces Arden L. Bement, Jr., who led the agency from 2004 until he resigned in May of this year.
Credit: R. Kaltschmidt/LBNL
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Paul Alivisatos has been appointed the seventh director of Lawrence Berkeley National Laboratory, which became effective in November 2009. Alivisatos replaces Steven Chu, who was sworn in as U.S. Secretary of Energy in Janua
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