Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!ox.com!fmsrl7!wreck
From: wreck@fmsrl7.UUCP (Ron Carter)
Newsgroups: sci.electronics
Subject: Re: SOLAR CELLS WITH HIGHPWER TO AREA RATIO
Summary: Can't do what you want done.
Message-ID: <44266@fmsrl7.UUCP>
Date: 24 Jun 91 17:25:36 GMT
References: <17973@chaph.usc.edu>
Reply-To: wreck@fmsrl7.UUCP (Ron Carter)
Organization: Ford Motor Company, Scientific Research Labs, Dearborn, MI
Lines: 27

In article <17973@chaph.usc.edu> rajha@girtab.usc.edu (T.R. Rajha) writes:
[wants a high power/area solar cell]
>The device will be used mostly indoors. Therefore the solar cell 
>should be able to operate in the indoor ambient lighting including
>incandecent and fluorescent lights. 

Have you considered how little power is available in most
interior lighting?

>It should be able to deliver a charge of approx. 50 mA at 4 volts

So you want 200 mW output.

>It should fit in area of approx. 60 sq. cm

So, 3.3 mW/cm^2, or 33 W/m^2.

Direct sunlight is about 1 KW/m^2 under the atmosphere.
The most efficient gallium-arsenide solar cells are
something like 20% efficient; they would produce 200 W/m^2
in full sunlight.  If you used them in your system, you
would be able to produce your desired power down to about
1/6 of full-solar illumination (170 W/m^2).

Indoor lighting is nowhere near that powerful.

I'm afraid you want something which doesn't exist.  Sorry.