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We are currently applying our core
competencies to develop potential products for various applications in
multiple industries. One potential product is a new type of solar cell
that performs like a traditional solar cell, but can be configured like
a light weight, flexible plastic. In particular, this technology has
the potential to provide low cost solar power through currently
available, high volume and inexpensive manufacturing techniques based
on conventional film based processes such as roll to roll
manufacturing.
As an illustration of our development process, using the following
steps, we have created a functioning solar cell:
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Synthesis: We develop
nanostructures for this application that are capable of light
absorption, charge generation and charge conduction when incorporated
into an appropriate matrix and thus act as a solar cell. We constructed
the nanostructure to absorb the sun's light in an optimal manner and to
separate resulting electrical charges.
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Assembly: To enable high volume,
inexpensive manufacturing, it is desirable to process the
nanostructures while suspended in a liquid and then harden the liquid
into a film. We selected a plastic matrix from which a film is made. We
also designed the specific surface chemistry on the nanostructures to
allow their uniform mixing into the plastic matrix.
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Nano to macro interface: Each
individual nanostructure generates electrical charges when it absorbs
the sun's rays. We designed the nanostructure's surface chemistry to
facilitate the transfer of electrical charges out of the nanostructure.
We apply traditional electrodes to the top and bottom of the film,
which is composed of trillions of nanostructure sized solar cells, to
transfer electrical charges out of the film into an electrical system,
such as a storage battery or electrical device.
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Application specific format: For
a solar cell, there are several application specific requirements:
light must enter the device, the cell must be connected to a circuit to
remove the electrical charges and the device must tolerate long-term
environmental exposure. We plan to select electrodes and encapsulating
films for our nanostructures to achieve the application specific
requirements.
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Computer modeling and simulation:
Throughout the development process, we use computer modeling and
simulation. We calculate the necessary physical and functional
properties of the individual nanostructures to guide synthesis. We
model the solar spectrum to determine the optimum absorption
characteristics of the nanostructures. We calculate the necessary
physical and functional properties of the nanostructures so that they
can act as solar cells. By modeling and simulating throughout the
process, we expect to minimize the number of design iterations, thereby
accelerating the entire development cycle.
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