Justin C. Johnson - Research Scientist
Justin Johnson received his B.A. in Chemistry and Physics from Macalester College in St. Paul, Minnesota, in 1999. His undergraduate research involved performing classical trajectory calculations for determining the rates of ion-dipole reactions of small molecules in the gas phase. He received his Ph.D. in Physical Chemistry from the University of California, Berkeley, in 2004, with Prof. Richard Saykally as thesis adviser. His thesis work included experiments involving near-field microscopy and ultrafast spectroscopy of single semiconductor nanowires, with a focus on determining the optical properties of various shapes of individual nanolasers.
Dr. Johnson joined Arthur Nozik’s group at NREL as a postdoctoral researcher through a collaboration with Prof. Josef Michl at the University of Colorado, Boulder, in October 2004. He is currently a research scientist collaborating with the research team of Dr. Nozik at NREL.
Project Description
The team is using spectroscopic tools to investigate the processes of multiple-exciton generation (MEG) and singlet fission (SF) and their consequences for photovoltaic devices. The ultrafast dynamics associated with these processes are especially important to understand, and therefore the team has developed various femtosecond techniques to study the mechanisms of SF and MEG, as well as charge transfer to semiconductor nanoparticle films.
Selected Publications
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J. Johnson, T. Reilly, A. Kanarr, J. van de Lagemaat. “Ultrafast exciton relaxation in surface plasmon active pentacene thin films,” J. Phys. Chem. C., in press.
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J. Johnson, K. Gerth, Q. Song, J. Murphy, G. Scholes, A. Nozik. “Ultrafast exciton fine structure relaxation dynamics in lead chalcogenide nanocrystals,” Nano Lett. 8, 1374 (2008).
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I. Paci; J. Johnson; X.D. Chen; G. Rana; D. Popovic; D. David; A. Nozik; M. Ratner; J. Michl. “Singlet fission: Can a suitable sensitizer be found?” Journal of the American Chemical Society 128, 16546-16553, (2006).
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J. Murphy, M. Beard, A. Norman, P. Ahrenkiel, J. Johnson, P. Yu, O. Micic, R. Ellingson, A. Nozik. “PbTe colloidal nanocrystals: synthesis, characterization, and multiple exciton generation,” J.Am. Chem. Soc. 128, 3241-7 (2006).
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M. Law, L. Greene, J.C. Johnson, R.J. Saykally, P. Yang. “ZnO nanowire dye-sensitized solar cells.” Nature Materials 4, 455-459 (2005).
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M. Law, D. Sirbuly, J.C. Johnson, J. Goldberger, R.J. Saykally, P. Yang. “Nanoribbon waveguides for subwavelength photonics integration,” Science 305, 1269 (2004).
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J.C. Johnson, H.-J. Choi, K.P. Knutsen, R.D. Schaller, P. Yang, R.J. Saykally. “Single Gallium Nitride Nanowire Lasers,” Nature Materials 1(2), 106-110 (2002).
NREL Publications
View NREL publications for this staff member.
Other Team Members
Justin C. Johnson |
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