Black Swan Solar Technology Emerges
Jul 27 - Business Wire
Scientists from the United States, Belgium and Korea are developing a
new and novel approach for collecting and converting solar energy to DC
output, which makes possible the design and fabrication of a new class
of solar energy converters. This breakthrough science offers the
potential for a dramatic increase in energy conversion efficiency and
cost savings compared to current solar cells. The technology can
successfully compete with and exceed in efficiencies and decreased costs
when compared with today's semiconductor-based solar cells. It is
scalable, sustainable, adaptable and environmentally friendly and will
allow manufacturers to quickly and economically shift to new materials
if a shortage of any one type occurs.
The technology is based on a unique "optical rectification" process that
uses a very simple, cost-effective, single element system that extracts
energy from the solar spectrum from the infrared through the visible.
This broad absorption of the solar spectrum very significantly
contributes to the gain in efficiency when compared to current solar
cells. The single element solar cell acts simultaneously as both a
receiving antenna and as a rectifier to absorb and convert solar energy
to an electric current. Such a device is historically termed a "rectenna"
and was developed for microwave power transmission, achieving
efficiencies up to 90%.
Since the device is fabricated using metallic antennas there are no
semiconductor band gap constraints or limitations. Furthermore the
single element solar cell can operate at elevated temperatures. By
contrast temperature degradation affecting operation can occur in
semiconductor based solar cells at about 200 F and higher.
In extensive computer simulations, scientists performed
quantum-mechanical calculations of geometrically asymmetric
metal-vacuum-metal tunnel junctions which model the single element
rectenna device. In these simulations the junction is irradiated by
light to simulate the solar spectrum. The results of computer
simulations agree with the rectification results of the actual operation
of the device. They also show rectification of light throughout the
visible region and a significant DC current output. The scientists
obtained efficiencies comparable to and exceeding those of current solar
cell devices. Efficiencies as high as 50% were recorded.
The scientists are currently developing prototype devices which
include more robust antenna structures and plasmonic effects to enhance
output and efficiency.
About Scitech Associates
Scitech Associates is a privately held US based research and development
company founded by Dr. Paul Cutler, Professor Emeritus of Physics at The
Pennsylvania State University. The company is focused on developing
commercially viable scientific applications for emerging technologies.
ScitechSolar is a division of Scitech Associates.
Additional information available at
http://www.scitechsolar.com
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