Affordable Solar Cell for Sunblock Experiment | UV Light & Electricity

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Discussion Overview

The discussion centers around the effects of sunblock lotions on the performance of solar cells, particularly in the context of an experiment comparing different sunblock products. Participants explore whether clear sunblock affects electricity production in solar cells and inquire about solar cells that utilize UV light for energy conversion.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • Derek questions whether a clear sunblock lotion (SPF 50) affects the electricity production of common solar cells.
  • Some participants inquire about basic solar cells that might be influenced by sunblock.
  • One participant speculates that sunblock may contain reflective materials, which could block various wavelengths of light, including those used by solar cells.
  • Another participant expresses uncertainty about whether solar cells can convert UV light into electricity and whether this conversion is significant enough to be measured when UV light is blocked by sunscreen.
  • Bob mentions vacuum photodiodes that respond to UV light and provides a reference to a specific model, suggesting a potential alternative for measuring UV light effects.
  • A later reply suggests that solar cells may not be ideal for testing UV absorption due to the absorption characteristics of silicon and discusses possible optical effects of sunscreen on solar cell performance.
  • Derek later shares an interest in finding a solar cell capable of powering a small car for the experiment but mentions alternative methods, such as using UV meters and UV-sensitive beads, to measure UV exposure.

Areas of Agreement / Disagreement

Participants express varying opinions on the impact of sunblock on solar cell performance, with no consensus reached on whether solar cells effectively utilize UV light or how sunblock may alter their functionality.

Contextual Notes

Participants express uncertainty regarding the specific mechanisms by which sunblock interacts with solar cells, including the potential for optical effects and the limitations of solar cell technology in measuring UV absorption.

derek50
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I'm looking for a cheap solar cell for an experiment that we're doing on different sunblock lotions.

Will a clear sunblock lotion (say spf 50) affect the ability for a common solar cell to produce electricity?

If the answer to the first question is no, is there a solar cell that does use UV light to produce electricity?

Thanks,

Derek
 
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Does anyone know of a basic solar cell that is affected by sunblock?
 
derek50 said:
Does anyone know of a basic solar cell that is affected by sunblock?

I think sunblock works by having tiny pieces of reflective material in it (e.g. metal flakes)... so yes, it would also block other wavelengths of light as well. (I could definitely be wrong here if sunblock does not work how I assume)
 
I know that the typical sunscreen blocks the harmful UV light that causes skin damage. I also know that a solar cell converts light into electricity. What I don't know is if a solar cell converts the UV spectrum of sun light into electricity as well as the normal visibal light. Even if a solar cell does convert UV light into electricity is it a substantial amount that could be detected if a sun screen is used to block the UV light.

Thanks for the reply.
 
There are a lot of vacuum photodiodes that have a response down to about 3000 Angstroms. My favorite was the RCA 935 vacuum photodiode. These had an extremely low leakage current, because the anode (plate) and cathode (photosensitive surface) are at opposite ends of the tube. See
http://ems.calumet.purdue.edu/chemphys/ncrelich/PortableDocuments/RCA%20Phototubes/RCAPhototube935.pdf
Bob S
 
Last edited by a moderator:
I think that Bob has been conducting some alcohol experiments. :wink: :smile:
 
A solar cell probably isn't a very good test of UV absorption.
UV is absorbed in the very top layers of silicon (because of the high-energy, short wavelength). It's possible that adding a sunscreen could have an optical effect, acting as an anti-reflection coating, or reflecting photons back into the cell or changing the surface properties of the silicon that would be a bigger effect than you are trying to measure.

Interestingly a lot of the techniques for improving the UV sensitivty of CCDs for astronomy were discovered from accidental contamination of the surface of the silicon with fingerprints, oil, maker pens etc.
 
Thanks for the info. I've been finding the same information but I was hoping to find a solar cell that could power a small car or something. Then we could measure the distance that the car would travel within a given amount of time as the way to measure the effectiveness of the different sun screens. Oh well. Not a big deal. I've found a UV meter and some UV sensitive beads that change colors when exposed to UV light. Not as cool as a solar powered car but still cool.

Thanks
 

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