Date: Thu, 17 Oct 2002 11:28:39 -0600

Author: Jerry DiMarco

Subject: Re: Solar Cells and Cadmium Sulfide Cells


Solar cells are not the simple devices they appear to be. There are
cells for use on the Earth (terrestrial) optimized for longer wavelengths,
and cells for space applications (space) optimized for shorter
wavelengths. In addition, cells may be optimized for low or high light
intensities, or may have reflecting or anti-reflecting coatings that are
wavelength dependent. The factors affecting performance are:
* the amount of light that gets to the active layer (affected by above
* operating temperature (also affected by above optimizations)
All I can suggest is to ask for specs before you buy. There are a lot more
manufacturers these days. A web search will give many hits...


At 10:06 AM10/17/2002, you wrote:

>I am trying to find some low cost solar cells, etc. that will show the
>same wavelength / energy dependance that the IP39 photoelectric tube
>shows. Namely, that the blue end of the spectrum will give the greater
>energy or response. I have tried everything I have laying around here
>with no success.
>Anyone know of something that will fit the bill??
>Thanks in advance,
>Dale Stille
>Univ. of Iowa


Jerry DiMarco
Manager of Lecture Demonstrations and Instructional Labs
Montana State Univ., Physics Dept.
Bozeman, MT

Our Motto: "We don't use anything the way it was meant to be used."