Elias Greenbaum, Ph.D.

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Elias Greenbaum, Ph.D.

• Corporate Fellow
• Oak Ridge National Laboratory

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Nanoscale Photovoltaics Artificial Sight
Elias Greenbaum Oak Ridge National Laboratory Oak
Ridge, Tennessee
February 24-27, 2009 Orford, Quebec, Canada
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Acknowledgements
Mark S. Humayun Christian P. Pannisi Ken
Yoshida Barbara R. Evans Hugh M. ONeill James W.
Lee Ida Lee Tanya Kuritz Charlene Sanders Miguel
Rodriguez, Jr. Barry Bruce Jennifer Millsaps DOE
Office of Basic Energy Sciences, Office of
Biological and Environmental Research
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Platinized Photosystem I Experiment
H
H2
H
H
PtCl62 4e ? Pt? 6Cl
Platinum
Ascorbic Acid
Plastocyanin
e-
Light
e-
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Differences in H2 Yield With Decreasing Chl
Concentration
Light off
Light on
Light off
Light on
Light off

Light on
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PSI on a Heterostructure
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Measurement of Electrostatic Potential in
Nanometer-Resolution Schematic Illustration
Kelvin Probe Method in Lift Mode
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AFM and KFM Images of PS I Reaction Centers
Immobilized on Gold
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PS I Photovoltage Topography Summary of Three
Types of Measurements
The vertical arrows in above figure indicate
three selected voltage points we used in this
table the two extremities and the center.
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Conceptual Illustration of Idea
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WERI-RbI retinoblastoma cells
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Spectral Properties of System
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FIRST STEP PSI RECONSTITUTION INTO
PROTEOLIPOSOMES
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NEXT STEP PSI INCORPORATION INTO MAMMALIAN
CELLS
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Light triggers increase in cytosolic Ca2 in
proteoliposome-treated cells
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Kinetic Time Course Experiments in the Presence
and Absence of PSI and External Calcium
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Spatial Distribution of the Electric Potential
From Photosystem I Reaction Centers in Lipid
Vesicles
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Distribution of the Electric Potential Close to a
PSI Reaction Center Inserted in the Vesicle
Membrane The Role of Ionic Strength
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0.1 M
IEEE Transactions on Nanobioscience, Vol. 7, No.
2, June 2008, Pennisi, Greenbaum Yoshida