Looks like the answer might be yes as nano particles, but there are someLead selenide has a bandgap of around 0.29 which is more than 1/3 that
of Si... is it possible to made solar cells out of this instead for a
huge increase in theoretical efficiency(several factors)?
is making organic semiconductors photostable in strong sunlight.
Tim said:On 18/10/11 18:23, Martin Brown wrote:
[by the way I agree about low cost possibly low efficiency cells being
the key]
Tricky bit
is making organic semiconductors photostable in strong sunlight.
And I think one of the problems with OLEDs, which I assume are a related
thin film technology, was stopping oxygen getting through the
thin-enough-to-be-transparent membranes protecting them. You can also
imagine that organic solar cells would be susceptible to being munched
by some obscure microorganism once they're common enough to provide a
reliable food source.
Some _formerly_ obscure microorganism.
I once saw an analysis where someone took the then-current pie-in-the-sky
projections of computing power out to the far future (probably the year
2000), and determined that once computers were that small, some bug would
evolve to eat them up.
OK. But what does it do to the white board surface? Well, there are soInteresting theory.
However, white board markers become difficult to erase even in the
absence of sunlight. Or even in the absence of fluorescent lighting.
All it takes is a few days in total darkness.
Lacquer thinner will instantly remove even the most stubborn white
board marks, as well as the "permanent" markers like Sharpies.
Art
On 18/10/11 18:23, Martin Brown wrote:
[by the way I agree about low cost possibly low efficiency cells being
the key]
Tricky bitis making organic semiconductors photostable in strong sunlight.
And I think one of the problems with OLEDs, which I assume are a related
thin film technology, was stopping oxygen getting through the
thin-enough-to-be-transparent membranes protecting them. You can also
imagine that organic solar cells would be susceptible to being munched
by some obscure microorganism once they're common enough to provide a
reliable food source.
Some _formerly_ obscure microorganism.
On 18/10/11 18:23, Martin Brown wrote:
[by the way I agree about low cost possibly low efficiency cells being
the key]
Tricky bitis making organic semiconductors photostable in strong sunlight.
And I think one of the problems with OLEDs, which I assume are a related
thin film technology, was stopping oxygen getting through the
thin-enough-to-be-transparent membranes protecting them. You can also
imagine that organic solar cells would be susceptible to being munched
by some obscure microorganism once they're common enough to provide a
reliable food source.
OLEDs have a layer of _calcium_metal_ in them, though, which is pretty
ridiculous. (A couple of my pals did a lot of the early work on OLEDs,
and I still tease them about that calcium metal layer....)
Cheers
Phil Hobbs
The problem is that the forward voltage of a PbSe diode is only a couple
of tenths of a volt. You're absorbing 2.5 eV photons and only getting
0.2 volts on the terminals--that gets you 8% efficiency even if there
were no other losses.
Cheers
Phil Hobbs
We didn't understand why our whiteboard in the conference room was
behaving so strangely until we figured that daylight has enough UV in
it to polymerize certain of the whiteboard marker pigments, which
makes them very difficult to erase after a couple of days.
Sunlight is nasty stuff. Even silicon solar cells degrade.
