Accidental Discovery of Almost 100% Efficient Solar Technolo

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Roger
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Accidental Discovery of Almost 100% Efficient Solar Technolo

Post by Roger »

Researchers at Ohio State University have accidentally discovered a new solar cell material capable of absorbing all of the sun's visible light energy. The material is comprised of a hybrid of plastics, molybdenum and titanium. The team discovered it not only fluoresces (as most solar cells do), but also phosphoresces. Electrons in a phosphorescent state remain at a place where they can be "siphoned off" as electricity over 7 million times longer than those generated in a fluorescent state. This combination of materials also utilizes the entire visible spectrum of light energy, translating into a theoretical potential of almost 100% efficiency. Commercial products are still years away, but this foundational work may well pave the way for a truly renewable form of clean, global energy.


http://www.tgdaily.com/html_tmp/content ... 7-113.html

A complete study of the team's work appears in the current issue of "Proceedings of the National Academy of Sciences" (PNAS).
Bumped into this at daily Kos, didnt follow up to see if its worthy, just doing a hit and run.
I like the p-B11 resonance peak at 50 KV acceleration. In2 years we'll know.

MSimon
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Post by MSimon »

Doubt they will get to 100%.

You still have the problem of energy spread. ( 400 to 1200 nm [UV to IR] = 3:1 spread on input energy )
Engineering is the art of making what you want from what you can get at a profit.

tombo
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Post by tombo »

Is the suggestion here to use this technology to capture the energy of the Bremsstrahlung radiation?
Of course nobody gets 100% efficiency at anything. but...
Efficiencies approaching unity would certainly help the energy balance and make the Bremsstrahlung losses into a more tractable problem.

Do we know its spectrum yet?
(Was that the 400 to 1200 nm you mentioned? I though you meant that for solar spectrum.)

Western Washington University had a project a few years back that used photovoltaics tuned to IR to convert combustion heat to electricity to drive an electric car motor. Of course it was made from some gawdawfuly toxic elements. IIRC it was a II-VI compound semiconductor system.

If this Ti-Mo-Plastic system can be tuned to the IR or the far IR the implications for waste heat recovery are staggering.
I mean: so what that the Magrid coils get hot we just recover the IR at "100%" efficiency with photovoltaics and push it back into the coils.
My TANSTAAFL detector is flashing "red-alert" ... "red-alert" ... "red-alert".


[edit another source says Mo-W-"thienyl rings" not Mo-Ti-plastic]
Here is a better article: http://www.laserfocusworld.com/display_ ... efficientl
They say the material covers whole visible spectrum 300-1000nm not 100% efficiency. This is more believable.
I hate the way journalists misunderstand and twist scientific statements.
Actually they do that to all statements as anyone who has been interviewed can attest.
-Tom Boydston-
"If we knew what we were doing, it wouldn’t be called research, would it?" ~Albert Einstein

gblaze42
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Post by gblaze42 »

http://www.eetimes.com/news/latest/show ... =211300474


another article, seems to clarify some of it.

tombo
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Post by tombo »

10,000 nm???
10,000 nm is the wavelength peak for 300K
That is ROOM TEMPERATURE
That has GOT to be a misprint.
-Tom Boydston-
"If we knew what we were doing, it wouldn’t be called research, would it?" ~Albert Einstein

KitemanSA
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Post by KitemanSA »

tombo wrote:10,000 nm???
10,000 nm is the wavelength peak for 300K
That is ROOM TEMPERATURE
That has GOT to be a misprint.
The link in you prior post states 1000, not 10,000. Which is the mis-print?

Betruger
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Post by Betruger »

It was edited since he posted..

tombo
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Post by tombo »

It is still in gblaze's EE Times linked article.
The link I posted Laser Focus graph shows it petering out below 900nm (~3200K).
Their supercomputer technique may turn up more compounds especially if they look for far IR formulas.
It sure would be nice to get it down to temperatures for reasonable materials.
They are probably motivated in that direction as there are many possible applications, so it is a possible technology in the medium term.
-Tom Boydston-
"If we knew what we were doing, it wouldn’t be called research, would it?" ~Albert Einstein

gblaze42
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Post by gblaze42 »

I've been trying to verify the 10,000 nm point without luck, even reading the original PNAS paper doesn't give me enough to confirm or deny.

Reasoning it out, I suppose if the material could absorb three photons at that wave length, it might work. At that energy level a single photon to electron photo-emission wouldn't work.

It's probably best to send Malcolm Chisholm an email to clarify this.

MSimon
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Post by MSimon »

gblaze42 wrote:I've been trying to verify the 10,000 nm point without luck, even reading the original PNAS paper doesn't give me enough to confirm or deny.

Reasoning it out, I suppose if the material could absorb three photons at that wave length, it might work. At that energy level a single photon to electron photo-emission wouldn't work.

It's probably best to send Malcolm Chisholm an email to clarify this.
If 10,000 nm = 300K I hardly see much use for .03 eV electrons.
Engineering is the art of making what you want from what you can get at a profit.

KitemanSA
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Post by KitemanSA »

I am much more interested in the 10nm side myself. Brem anyone?

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