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Get Ready for the Next Advance in Solar Energy

Commodities / Solar Energy Jul 31, 2015 - 12:20 PM GMT

By: ...

Commodities

MoneyMorning.com Dr. Kent Moors writes: Despite limitations, solar has reached grid parity in a number of regions in the U.S. That means sun power is as cost efficient as electricity utilizing more conventional sources like coal and natural gas. But it still has some limitations that prevent it from becoming the main source of power.

Usually the discussion of how solar energy will develop centers on improving the inversion process or combining greater efficiency in generation with a better battery technology to store what is produced.


Inversion addresses the transfer of DC-generated electricity to the AC needed to move it on the grid. Between a third and a half of all power produced is currently lost in this process.

Meanwhile, coming up with a genuinely revolutionary battery approach would allow for the electricity obtained while the sun is out to be used once it sets. After all, cloudy days and the overnight period remain the biggest drawbacks to solar becoming the energy source of choice.

Here’s my take on how solar power will develop next… 

New Research Into Solar Efficiency

New approaches in the design of solar panels may just be the next push for a solar revolution. As always, such new introductions await a verdict on cost. Advances that are too expensive are not going to see the light of day (no pun intended).

But research is certainly making matters interesting these days. With the capital costs of networks and infrastructure already met and major utilities increasing relying on solar, the next major push will be in making the generating process more efficient, thereby reducing the overall price of the energy obtained.

One such advance is already out there, although still in its infancy. The prospects for graphene coatings are vast. The energy advantages here across the board will be staggering… once production problems are overcome.

But another advance, increasing the amount of the spectrum employed, could be as promising. Combining the two may just be the ticket to revolutionizing how we produce electricity.

This advance involves using previously unavailable infrared to increase what light is used in power generation.

Breakthrough Solar Research

Two days ago, Graham Templeton published a fascinating piece in ExtremeTech addressing breakthrough research at the University of California, Riverside.

In the piece, Graham says:

An innovative new approach to solar energy from University of California, Riverside could dramatically increase the amount of light available to contemporary solar panel designs. Rather than widening the absorption spectrum of the solar panels themselves, this new study looked at taking currently inaccessible infrared light and turning it into visible light. They hope that by directing this newly fabricated light onto conventional solar panels, the efficiency of solar power could be greatly improved, for an affordable price.Infrared light currently passes straight through most silicon solar cell technologies, representing a substantial inefficiency in generating electricity from sunlight. Much of solar research has worked to directly convert infrared light to electricity, but such technologies change the transistor design, and thus the manufacturing process for solar panels. Their impacts tend to be limited by cost concerns, more than anything else.This transistor concept can trap and absorb infrared radiation, but current manufacturers can’t make it cheaply

These researchers chose to accept the absorptive abilities of current silicon transistors, and instead looked to make the light conform to the panels. They created an all-new hybrid material that takes two photons of 980-nanometer infrared light shone onto it and “up converts” them into one photon of 550-nanometer orange/yellow light. This photon has almost double the energy of the originals and, more importantly, it exists in a form that existing solar panels can absorb.

By changing the incoming sunlight into silicon’s favorite for absorption, the material could improve solar panel efficiency by as much as 30%. And while the costs of the material itself are not yet known, there is huge potential in offering such large improvements without the need to completely reinvent the transistor manufacturing process.

This hybrid material combines two things: an inorganic layer with semiconductor nanoparticles – this absorbs the infrared light, but isn’t capable of directly passing it into the electricity generating process. Instead, the light moves on to the organic phase of the material, which takes these long-wavelength photons and combines them. The resulting, lower-wavelength photons can move on to be absorbed by the transistors of the solar panel as normal, just as though it has been that color upon first arrival.

The overall costs of solar power lie much more in installation, maintenance, and land use costs than in the panels themselves; adding a new layer of this infrared-capturing material would certainly increase panel costs, but could still improve the affordability of solar power. Infrared radiation accounts for an enormous amount of the energy in direct sunlight, and it is currently being missed by every solar panel outside of a research laboratory.

In general, this sort of research into the manipulation of light could allow a wider rollout of solar power around the world. Plenty of raw energy is falling on highly clouded days, but the distribution of that energy through the spectrum is different, and harder for modern solar panels to turn into power. Infrared radiation moves through an overcast sky quite well, however; if its energy could be added to that of the cloud-filtered visible light, solar might start to make good financial sense in less sunny areas than Texas and California.

The ability to accurately convert photons between wavelengths could have a wide range of applications, from medical imaging to optical data storage, but none is so direct as solar power. Energy will be one of the defining issues of the next few decades, and while some all-new tech revolution may end up saving the day, evolutionary steps like this one will be needed to sustain the world until that day comes.

An Add-on to What Is Currently Available

Advances such as this, perhaps combined with a thin layer of graphene, would cut the price of generating electricity via solar panels to levels never imagined by the original pioneers in renewable energy.

That the process is compatible with current panel manufacturing specs is a big advantage. It becomes an add-on to what is currently available in the market. It all comes down to the actual   cost of doing it.

Now if only the Energizer Bunny or his pals could just come up with a better way of storing what is generated…

Source :http://oilandenergyinvestor.com/2015/07/get-ready-for-the-next-advance-in-solar-energy/

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