This article is a
collaboration from a reader
College of Illinois Scientists
Provide Us Little Known Ways to Produce More Effective Pv panels
by Shannon Combs
Although silicon is actually the
market common semiconductor in many electrical devices, including the
photovoltaic cells that solar panels utilize to transform sunshine into
energy, it is hardly the most efficient product available. For instance,
the semiconductor gallium arsenide and connected compound semiconductors
provide close to twice the effectiveness as silicon in solar units, but
they are rarely used in utility-scale applications because of their
excessive production cost.
University. of Illinois. (http://illinois.edu/)
teachers J. Rogers and X. Li discovered lower-cost techniques to create
thin films of gallium arsenide that also made possible flexibility in
the kinds of units they can be integrated into.
If you may lower significantly the
expense of gallium arsenide and some other compound semiconductors, then
you can increase their range of applications.
Usually, gallium arsenide is
deposited in a individual thin layer on a little wafer. Either the ideal
device is made directly on the wafer, or the semiconductor-coated wafer
is break up into chips of the ideal size. The Illinois group decided to
put in numerous layers of the material on a simple wafer, making a
layered, “pancake” stack of gallium arsenide thin films.
If you grow ten layers in 1 growth,
you simply have to load the wafer one time. If you do this in ten
growths, loading and unloading with temp ramp-up and ramp-down take a
lot of time. If you consider what is necessary for each growth – the
equipment, the planning, the time, the workers – the overhead saving
this method provides is a substantial price decrease.
After that the experts individually
peel off the layers and transfer them. To accomplish this, the stacks
alternate layers of aluminum arsenide with the gallium arsenide. Bathing
the stacks in a formula of acid and an oxidizing agent dissolves the
levels of aluminum arsenide, freeing the single small sheets of gallium
arsenide. A soft stamp-like system picks up the layers, one at a time
from the top down, for transfer to one other substrate – glass, plastic
material or silicon, based on the application. Then the wafer can be
used again for one more growth.
executing this it's possible to produce a lot more material a lot more
fast and a lot more cost effectively. This process could produce bulk
amounts of material, as compared to just the thin single-layer way in
which it is generally grown.
Freeing the material from the wafer
additionally starts the opportunity of flexible, thin-film electronics
produced with gallium arsenide or other high-speed semiconductors.
To make products
that can conform but still retain higher efficiency, which is
In a document published
online May twenty in the journal Nature (http://www.nature.com/), the
group describes its techniques and shows three kinds of products
utilizing gallium arsenide chips made in multilayer stacks: light
products, high-speed transistors and solar cells. The creators also
offer a comprehensive price comparison.
One more advantage
associated with the multilayer technique is the release from area
constraints, especially crucial for solar cells. As the levels are
removed from the stack, they may be laid out side-by-side on another
substrate in order to generate a much larger surface area, whereas the
standard single-layer process restricts area to the size of the wafer.
For solar panels, you want
big area coverage to get as much sunlight as possible. In an extreme
situation we could increase sufficient layers to have 10 times the area
of the traditional.
After that, the team
programs to investigate more possible device applications and other
semiconductor resources that could adapt to multilayer growth.
About the Source - Shannon
Combs writes for the <a
href="http://www.residentialsolarpanels.org/">residential solar power
options</a> web log, her personal hobby website centered on points to
help home owners to save energy with solar power.
Hi, I’m Shannon and I write Residentialsolarpanels.org to help You get
info to make the transition from a full-time energy dependent to
successful energy efficiency.
I started Residentialsolarpanels.org in 2008 to help people who want to
save energy using solar power or deal with the sometimes overwhelming
prospect of starting a PV system.
Prior to raising my family, I spent over 3 years as a teacher and