Re: Beamer

From: Mike Lorrey (
Date: Mon Dec 17 2001 - 10:43:23 MST

"Robert J. Bradbury" wrote:
> On Fri, 14 Dec 2001, Anders Sandberg wrote:
> > What would the efficiency of simple moon made photovoltaics be, and
> > what about the energy requirements for mass sorters and robots?
> Regular Si solar cells are certainly feasible in the 10-20% region
> (the lower efficiencies being poly-silicon which may be easier to
> produce on the Moon). You might be able to push it up to ~24%. But
> you have to use multi-layer cells made from different materials with
> higher and lower energy band gaps to get into the 30+% region.
> If you are using nano-mass sorters like the single proton massometer
> from Nanomedicine, I suspect the energy requirements are very low.
> If you are talking macro-tech they are probably quite a bit higher.
> In mass-spec sorting you have ionize the atoms to put a charge on
> them so you can accelerate them through a field that will sort them
> by mass.

Using simple reflectors to focus solar flux on fewer cells will not only
make it easier, but cell efficiency increases with flux levels.

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