Eugene Leitl wrote:
>
> Raymond G. Van De Walker writes:
>
> > I'd love to see a reference on these.
>
> Well, there is not much on the web. Efficiency is not the primarily
> goal: integrated cost of operation/produced W over the lifetime are.
>
> Kraut: http://www.hmi.de/bereiche/F/ag_solar/tandem.html
>
> http://www.jjap.or.jp/s_contents/S32-3.html
>
> http://www.pv.unsw.edu.au/eff/
>
> Just ask your engine for CuInSe. Raw hit content <200, and you can
> always refine.
Yes, getting the cost per kwh down to competetive rates with utilities
using conventional power sources is what is needed. GaAs/GaAn cells are
the peak of efficiency at 33-34%, but their cost per kwh is way out
there. They are only cost effective where weight is at a premium, i.e.
space based applications. There are thin film amorphous Si panels
relatively indistinguishable from US Solar that can be had for a cost of
between $0.12-0.25 per kwh, which is getting there, even though those
panels are at most 10% efficient.
Mike Lorrey