Which is already pretty challenging when you are operating this at 20 or
15 meters a minute.
Bring us up to speed.
>> Four kilometers.
>> Or during the kilometer where it all leads to what?
You can't screw up the 5 meters because then all this is likely to then be shun.
It has to be predictably wrong or we have to be able to know that we
have one matching the two crosses for every unit setup this grid stops.
And that's why we came up with this kind of grid.
If we have a different device geometry or the printed direction was different,
it would be an easy case to realize this structure that's on the screen now.
[NOISE] That the- We have
an emergency here in our lab.
[NOISE] Not our building it doesn't seem to be in this building.
[LAUGH] Okay,
we will wait two
seconds until
this is over.
>> [INAUDIBLE] >> Okay, so
apparently we had a fire alarm and it wasn't in this building so
we'll continue on until the fire spreads up here.
[LAUGH] Okay, I think the next question I see in here is can you give
a little bit more explanation about what a hole is in the solar cell?
>> So, a hole is a carrier or a hole is a- >> Is a carrier.
Yeah.
>> Well, I think we had the question earlier, in one of the earlier,
where you don't have an electron.
>> Yeah. >> As opposed to-
>> And I guess the
>> What he asks is,
in a material sense what is a hole.
And I guess the answer is.
If you want a chemical explanation it's a keri.
>> So if you remove an electron from an organic material you have a radical keri.
And this is what a hole is.
>> It's a little special in this case because normally the host
fixed up the hands and in this case the host can actually move.
But generally the whole moves by a movement of electrons.
So there's a hole and there's an electron next to it
on the keri that drops in there and the hole's somewhere else.
So, you always have- and that's how the hole moves.
And it is I suppose the whole electron picture is an extraction.
And it makes it easier to rationalize how the demise works.
>> Okay, the next question here is related to PIDA PSS and
what happens when it's in a humid area.
So will there be a difference in lifetime whereas for seashore or
dry conditions for example?