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Re: Photonic crystals keep solar cells cool while still catching light

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Dne 06/05/2016 v 17:52 Sergio napsal(a):
> On 5/6/2016 8:58 AM, Sam Wormley wrote:

>>> Solar cells turn sunlight into electricity, but they're only about 20
>>> percent efficient. Much of the leftover energy turns into heat, which
>>> actually harms the solar cell.
> 
> ....only if the temp gets up near melting point 300 degrees

Aging of cover layers and and decreased efficiency of semicoductor
happens deep below the melting point.
> 
>>>
>>> Now researchers from Stanford University, Palo Alto, California, USA,
>>> have developed and tested a new material that can cool a solar cell
>>> by up to 13° Celsius (C) under the California winter sun. Because
>>> heat makes solar cells less efficient, the researchers predict their
>>> cooling layer could help solar cells turn approximately 1 percent
>>> more sunlight into electricity, a big boost from a relatively simple
>>> add-on.
> 
> what is the cost of this cooling system 2% ?

Aluminum was used as rare metal for medals in Napoleon era....
Exerything is expensive during research.
> 
> 
>> The cooler temperatures also mean the solar cells will likely
>>> last longer due to greatly reduced efficiency degradation rates.
> 
>           no.

Rate of chemical raactions increases 2-4 times per 10 deg C increase,
including degradation ones.

> 
> cooling solar cells for greater efficiency has been known for 4 decades 
> or more.  cost stops implementation

Active or passive ?

-- 
Poutnik ( The Pilgrim, Der Wanderer )
Knowledge makes great men humble, but small men arrogant.

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Photonic crystals keep solar cells cool while still catching light Sam Wormley <swormley1@gmail.com> - 2016-05-06 08:58 -0500
  Re: Photonic crystals keep solar cells cool while still catching light Sergio <invalid@invalid.com> - 2016-05-06 10:52 -0500
    Re: Photonic crystals keep solar cells cool while still catching light Poutnik <poutnik4nntp@gmail.com> - 2016-05-06 20:01 +0200
  Re: Photonic crystals keep solar cells cool while still catching light jimp@specsol.spam.sux.com - 2016-05-06 17:31 +0000

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