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OT: The News Thread

http://www.physorg.com/news/2011-12-scientists-solar-cell-electrons-photocurrent.html

The external quantum efficiency for photocurrent, usually expressed as a percentage, is the number of electrons flowing per second in the external circuit of a solar cell divided by the number of photons per second of a specific energy (or wavelength) that enter the solar cell. None of the solar cells to date exhibit external photocurrent quantum efficiencies above 100 percent at any wavelength in the solar spectrum.

The external quantum efficiency reached a peak value of 114 percent. The newly reported work marks a promising step toward developing Next Generation Solar Cells for both solar electricity and solar fuels that will be competitive with, or perhaps less costly than, energy from fossil or nuclear fuels.

Multiple Exciton Generation is key to making it possible

A paper on the breakthrough appears in the Dec. 16 issue of Science Magazine. Titled “Peak External Photocurrent Quantum Efficiency Exceeding 100 percent via MEG in a Quantum Dot Solar Cell,” it is co-authored by NREL scientists Octavi E. Semonin, Joseph M. Luther, Sukgeun Choi, Hsiang-Yu Chen, Jianbo Gao, Arthur J. Nozikand Matthew C. Beard. The research was supported by the Center for Advanced Solar Photophysics, an Energy Frontier Research Center funded by the DOE Office of Science, Office of Basic Energy Sciences. Semonin and Nozik are also affiliated with the University of Colorado at Boulder.

The mechanism for producing a quantum efficiency above 100 percent with solar photons is based on a process called Multiple Exciton Generation (MEG), whereby a single absorbed photon of appropriately high energy can produce more than one electron-hole pair per absorbed photon.


Poor HA. I remember when he tried to tell me that solar tech was more or less topped out in potential efficiency.
 
http://www.energyboom.com/solar/semprius-achieves-41-percent-efficiency

On December 14, the National Renewable Energy Laboratory, or NREL, announced that it had confirmed an efficiency rating greater than 41 percent for solar cells made by Durham, North Carolina-based Semprius.
This efficiency rating is calculated on the ability of the low-cost lenses incorporated Semprius’s gallium-arsenide (GaAs) cells to concentrate sunlight (to an intensity of 1,000 suns) on solar cells with a sufficiently wide optical angle to maximize solar insulation and reduce tracker costs.

The company is using GaAs, but notes on its website that other semiconductors are also suitable, including silicon, amorphous silicon, gallium nitride, indium phosphide and even diamond, since the original substrate can be used repeatedly.

The result is concentrating solar photovoltaics, or CPV, from triple-junction GaAs cells a mere 600 microns in diameter. The cornea in the human eye is about 560 microns thick.

Perhaps the most important part of Semprius’s manufacturing process, and the innovation that earned them $500,000 in stimulus seed money in 2009 and a spot, in 2010, with the U.S. Department of Energy’s (DOE’s) SunShot Initiative program, is their massively parallel patented micro-transfer printing.

This process allows fabricators to use standard semiconductor processes to print a solar cell and then transfer the “print” to another substrate so that the original substrate can be used again and again. The process is also applicable to other forms of manufacturing as well.
 
I find it amazing that there are people this smart to figure this stuff out. Hell the title of the first article alone is so complex. The capabilities of the mind is amazing
 
... and since you're single, give her a call.
If I wasn't so happy and secure I'd probably be bothered by your extremely personal jabs.

Fortunately I likely have a far more exciting and fulfilling life than you.

And yes, I do see the irony of posting this at 11pm on a Saturday, but I'm waiting for a cab.
 
Poor HA. I remember when he tried to tell me that solar tech was more or less topped out in potential efficiency.

The only problem with that is that it's pure garbage.

This is what I said.....

So far, it's still the old technology.......at breakneck competition levels. There is a German company that has reached 20% yield commercially, but there is still no major game changer in yield. Panels themselves came down in three years from $2.20 per watt to $1.10, which is good, but still not the $1.00/watt net including inverters and supports.

The day we can spend a grand or two for a couple of 4x8 solar panels yielding what a household consumes for the year will be the day the game changes forever. As an example, everyone in Greece uses solar for their hot water. It's a very mature technology that has reached a point where you go to the local distributor, order one for 500-600 Euros and the next day, they come to install it. For the next 15-20 years, you have trouble free hot water (most of the time).

I said CURRENT COMMERCIAL solar technology. I also said that we shouldn't be paying for current technology because it made no sense financially. AND I also said that I support future breakthroughs as long as they were COST effective.

As for wind turbines. I said that it's a mature technology (90%+). I also said we have reached close to the end on cost versus size since going higher raises the cost geometrically.

If this was a nothing but a pot shot then......

.......poor you, Googling isn't making you smarter......or funnier. :thumbsup(22):
 
The leading German solar company declared bankruptcy a few days ago. Meanwhile. McStupid is till screaming about "solar jobs".....which we will pay for 20 years.......and evaporate the second there are no subsidies.

This is pretty good article that touches on the stupidity of green energy in it's current form and the real cost to the economy.

~~~~~~~~~~~

German Solar Dreams - So Long Or Goodbye ?

Solon SE, in 1998, was Germany’s first listed solar photovoltaic producer. In Frankfurt trading on 15 December it stock price fell 46 percent to around 50 euro cents. The Berlin-based company had filed for insolvency after failing to reach an “arrangement” with banks and investors, its brief statement said. This was the first publicly traded German solar cell-making company to file for insolvency. Analysts noted the company had failed to cut costs fast enough and was unlikely to repay a 275-million-euro loan from Deutsche Bank and a group of seven German banks, due by 31 December.

The reasons for this sudden collapse are in fact endemic in the solar PV industry - even in China the industry has large, even massive surplus capacity relative to reasonable or possible market growth trends and absorbtion capacity. In Germany, as of May 2011, more than 18 000 megawatts (18 GW) of solar power had been installed, with over 85% of the cells home-produced. In year 2010 alone, the German solar PV industry produced and installed 7.4 GW in nearly one-quarter million individual systems. In 2010, solar PV stations supplied about 12 billion kilowatt-hours of electricity, around 2% of national consumption, but hopes that the growth curve can keep going, to as high as 25% of total consumption well before 2040, which German solar companies and their finance industry backers claim they can do, is now looking very unlikely.

The industry, drunk on subsidies simply grew too fast. US and especially European producers are the hardest hit. Workers in Germany's once booming solar energy industry now face a shakeout of epic proportions driven by ever falling prices for solar panels over the past year. Falling panel prices are a lot more the result of commercial and economic factors, including company bankruptcies than technology or industrial progress driving down unit costs. Solar electricity was always expensive and will stay expensive - tech progress only makes it relatively less expensive.


A LOT more in here......

http://www.marketoracle.co.uk/Article32184.html

~~~~~~~~~

BTW....as I have written before, about three years ago I had this stupid idea about assembling solar panels. I contacted Solon and their arrogance was breathtaking. Any time that Solon salesman needs a job, my floors need sweeping.
 
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I'm simply genuinely curious if you believe in heaven and hell.......

I know people who I consider pretty smart and they genuinely believe in heaven/hell and other parts of the bible.

I use to criticize religious people relentlessly. Then I had some get together with highly religious Reps/Cons/TeaParty and they accept/befriend me and my atheism without criticism. That was a bit of an eye opener and a change on my part.

So now, I find myself defending them whenever people take pot shots. Live and let live........
 
I find it amazing that there are people this smart to figure this stuff out. Hell the title of the first article alone is so complex. The capabilities of the mind is amazing

From Joe Rogan's blog, circa 2002...

We like to think that we’re smarter than people from the recent past, but all we have over them is the improved ability to communicate. We have the internet. We can talk to people from anywhere and everywhere. We can pretend to be 13-year-old girls to lure in perverts.

We are a people that need and exist on things that we have very little knowledge of. Most of our daily lives are filled with technology that we barely understand on the most basic level, and if we had to duplicate it, we would be horribly lost. I have but a rudimentary knowledge of how electricity works. I just turn on switches and pay my power bill.

I love technology, and I even build my own computers, but where would I be without a company to make the parts? If all the parts and manufacturing plants were 400 feet under the ocean, how long would it take for me to figure out how to make one on my own? The answer is it would never happen.

Not in 500 years.

What would the most advanced coders and programmers do if they were stuck in the wooded peaks of mountains?

They would try to survive.

Would they have children?

Perhaps.

Would they pass down the knowledge of computers?

They would tell stories, and try to explain it, but by the time their grandchildren have grandchildren, it will all be nothing but myth.

No one would have a phone to communicate with. Languages would evolve and morph, and if you traveled just a few hundred miles, it would be like stepping into a foreign country. Sort of like how it is now in other parts of the world.

With what little the average American knows about the very things that shape our society, within two generations, all would be lost.

Our documentation of our achievements is all on flimsy, fragile mediums like paper and hard drives. The spoken word can’t be trusted even today with full control over mass communication. For the most part, people are liars with weak minds. Despite all the evidence to the contrary, we still teach our children that Columbus discovered America, and Lee Harvey Oswald acted alone.

I watch documentaries about the pyramids and all sorts of ancient structures that we can’t explain, and it’s all beginning to make sense.

We’ve been this way before, and it’s probably not the last time this is going to happen. This is all just temporary, and people are going to start again from scratch. Who knows, maybe they’ll even get it right this time.

http://blog.joerogan.net/archives/82
 
We may be more educated, but you can't say that we are really any more intelligent. Look at the morons walking around outside someday. Just talk to somebody.

I saw a stand up Rogan did that was similar to this blog entry. Basically, if anything were to happen to all the smart people in the world, they all got wiped out by some asteroid or virus, whatever, we are two generations away from living in caves. We all know how to use a cell phone, but who could actually build one?

It's just the simple truth.
 
All of that entitlement, laziness, and inability to look after oneself in the literal sense can be linked to over-specialization in our civilization. Sedentary living derived from the ability to produce reliable crops year-round and substantive enough food sources allowed for permanent dwellings and social hierarchies to emerge that are impractical when the pursuit of food 24/7 is required.

In the past a man would know how to make his own clothes, shoot and skin wild animals for sustenance, grow his own crops, bake his own bread, repair his own shoes or weapons, and would have been in top-notch physical condition to boot. We were a society of many talents and we needed to be in order to live well.

The exponential improvement in living standards and denigration into millions of different jobs, most of which are largely pointless from a survival standpoint, has resulted in a lazy, degenerate species that cannot do anything for themselves. I would love to learn how to turn, build, and forage properly but when you have minimal need for such skills in an environment where I can simply order groceries on my smart phone or go to the local gym for exercise, we have lost these essential trades. It's a true shame but it's true. Our arrogance as a civilization will once again lead to our downfall.
 
I think a good chunk of being "smart" is a result of education/knowledge so while I agree with much of what he says i'm not ready to make a dismissal like "we're just more knowledgable, not smarter".

and there's no doubt that as our civilization grows, our individual knowledge bases become more specified, and more dependant on the "system", but that's how civilization works and grows, so I'm not so sure that's a real criticism. Division of Labour is a basic necessity of our civilization, and since there's now way we can all be experts on everything, it's much better to have individuals become experts in specific fields, and let others be the experts in theirs. That's the only way the civilization as a whole can gain true expertise in as many fields as possible.
 
The only problem with that is that it's pure garbage.

This is what I said.....



I said CURRENT COMMERCIAL solar technology. I also said that we shouldn't be paying for current technology because it made no sense financially. AND I also said that I support future breakthroughs as long as they were COST effective.

As for wind turbines. I said that it's a mature technology (90%+). I also said we have reached close to the end on cost versus size since going higher raises the cost geometrically.

If this was a nothing but a pot shot then......

.......poor you, Googling isn't making you smarter......or funnier. :thumbsup(22):

This 'google' bit of yours is neither accurate (I found those stories on Reddit), nor insightful, nor clever.

As for the rest, all I have to say is this. Bow down to your solar overlords. Embrace the future.

Tell me again how awesome uranium/plutonium based nuclear and "clean" coal are.
 
That's good coke-convo lol.
I do believe people were just as smart, we're just better educated in general now. Differently as well obviously.

I wanted to quote the blog, but it was too long... I didn't mean that people in general are smarter... I was talking about that group of people that ME was referencing who wrote that article in the science journal... I was just amazed how there are people that smart to have in their mind the concept of what is going on on molecular levels, and how to understand them. The break through of technology helps this of course, but just the understanding of complex physics and mathematics is what I was impressed with.

Sure the average person can't make a micro chip or anything like that, but the fact that we have people in this world who can figure this shiite out is what is cool to me.
 
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