School of Illinois Experts Demonstrate Us Little Known Solutions to Create More Economical Solar panels

by Shannon

Although silicon is actually the market standard semiconductor in most electric devices, which includes the solar cells that photovoltaic panels use to convert sunlight into electricity, it is hardly the most efficient component readily available. For instance, the semiconductor gallium arsenide and associated ingredient semiconductors offer nearly twice the performance as silicon in solar units, however they are rarely used in utility-scale applications mainly because of their high production value.

U. of Illinois. University of Illinois professors J. Rogers and X. Li discovered lower-cost ways to produce thin films of gallium arsenide that also allowed adaptability in the sorts of devices they could be incorporated into.

If you could minimize substantially the price of gallium arsenide and some other compound semiconductors, then you can develop their variety of applications.

Typically, gallium arsenide is transferred in a individual thin layer on a little wafer. Either the desired unit is made specifically on the wafer, or the semiconductor-coated wafer is cut up into chips of the ideal size. The Illinois group chose to put in multiple levels of the material on a simple wafer, making a layered, “pancake” stack of gallium arsenide thin films.

If you increase ten layers in one growth, you only have to load the wafer 1 time. If you do this in ten growths, loading and unloading with heat range ramp-up and ramp-down get a lot of time. If you consider exactly what is required for each growth – the machine, the preparation, the period, the workers – the overhead saving this technique gives is a important cost decrease.

Following the scientists separately peel off the levels and shift them. To accomplish this, the stacks swap layers of aluminum arsenide with the gallium arsenide. Bathing the stacks in a formula of acid and an oxidizing agent dissolves the layers of aluminum arsenide, freeing the single thin sheets of gallium arsenide. A soft stamp-like device selects up the

levels, one at a time from the top down, for transfer to one more substrate – glass, plastic material or silicon, based on the application. Next the wafer could be reused for an additional growth.

By doing this it's possible to create a lot more material a lot more fast and more price effectively. This process could make bulk amounts of material, as opposed to just the thin single-layer method in which it is generally grown.

Freeing the material from the wafer also starts the probability of flexible, thin-film electronics produced with gallium arsenide or some other high-speed semiconductors. To make products that could conform but still maintain high performance, which is significant.

In a paper shared on-line May twenty in the publication Nature Nature Publishing Group, the team details its procedures and demonstrates 3 kinds of products using gallium arsenide chips produced in multilayer stacks: light units, high-speed transistors and solar cells. The authors also provide a comprehensive cost evaluation.

One more benefit of the multilayer technique is the release from area constraints, specifically important for photo voltaic cells. As the layers are eliminated from the stack, they can be laid out side-by-side on one more substrate in order to generate a significantly greater surface area, whereas the typical single-layer method limits area to the size of the wafer.

For solar panels, you want large area coverage to catch as much sunshine as possible. In an extreme case we may grow adequate levels to have 10 times the area of the standard.

After that, the group programs to explore more possible product applications and other semiconductor materials which might adapt to multilayer growth.

About the Article author - Shannon Combs is currently writing for the residential solar power calculator website, her personal hobby website centered on tips to aid home owners to save energy with solar power.

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Sep 26, 2011
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